Callouts Disappear in Reading Mode When Using Light Themes

I’m running into a problem with my code — it’s almost finished, but there’s one major issue.
Whenever I switch to Reading Mode, the callouts disappear.

This only happens when using light themes, specifically page-white and page-manila.
In Live Preview, everything works perfectly, so the issue seems to affect only Reading Mode in those themes.

For a bit more context, here’s the GitHub (just search my name on it) repository and some reference images:
Live Preview:


Reading Mode:

Code:

/*------------------------------------------------------------------------------
              Notebook Background Color Schemes by CyanVoxel v2.2.3

These a few CSS classes that mimic a few of my real-world pages and pen colors.
Go ahead and try it out! You can change or add new color variables or entire new
classes and combinations. Inside Obsidian, apply a page class with an optional
pen color class to see the effects. Add the recolor-images class to recolor
the images in your notes, too!

Website used to generate Color Filters:
https://angel-rs.github.io/css-color-filter-generator
                
------------------------------------------------------------------------------*/

/* Global Variables */
:root {
  /* Base Pen Colors */
  --pen-white: #edf1fc;
  --pen-gray: #5f5d58;
  --pen-black: #26241f;
  --pen-red: #e14a49;
  --pen-green: #15b64f;
  --pen-blue: #3f76ed;
  --pen-light-blue: #54b6f8;
  --pen-purple: #9b4ff0;

  --neutral-pen-black: #272727;
  --neutral-pen-black-trans: #27272722;

  /* Page Colors */
  --page-white: #ffffff;
  --page-manila: #f3deaf;
  --page-blue: #3f76ed;

  --grid-size: 32px;
}

/* Recolors images on the page with the current accent color. */
.recolor-images img {
  filter: var(--image-effect);
}

/* ---------------------------- Page Backgrounds ---------------------------- */
/* All Pages */
.page-manila,
.page-white,
.page-blueprint {
  --text-normal: var(--accent-color);
  --text-muted: var(--accent-color);
  --text-faint: var(--accent-color-trans);
  --h1-color: var(--accent-color);
  --h2-color: var(--accent-color);
  --h3-color: var(--accent-color);
  --h4-color: var(--accent-color);
  --h5-color: var(--accent-color);
  --h6-color: var(--accent-color);
  --link-color: var(--pen-blue);
  --link-color-hover: var(--pen-light-blue);
  --link-unresolved-color: var(--pen-red);

  --hr-color: var(--accent-color);
  --blockquote-border-color: var(--accent-color);
  --callout-blend-mode: var(--highlight-mix-blend-mode); 
  --callout-bug: var(--accent-color);
  --callout-default: var(--accent-color);
  --callout-error: var(--accent-color);
  --callout-example: var(--accent-color);
  --callout-fail: var(--accent-color);
  --callout-important: var(--accent-color);
  --callout-info: var(--accent-color);
  --callout-question: var(--accent-color);
  --callout-success: var(--accent-color);
  --callout-summary: var(--accent-color);
  --callout-tip: var(--accent-color);
  --callout-todo: var(--accent-color);
  --callout-warning: var(--accent-color);

  --embed-border-left: 2px solid var(--accent-color);
  --collapse-icon-color-collapsed: var(--accent-color);
  --checkbox-color: var(--accent-color);
  --checkbox-marker-color: var(--page-color);
  --checkbox-color-hover: var(--accent-color-trans);
  --checkbox-border-color: var(--accent-color);
  --checklist-done-color: var(--accent-color);
  --list-marker-color: var(--accent-color);

  --interactive-accent: var(--accent-color);
  --metadata-label-text-color: var(--accent-color);
  --metadata-input-text-color: var(--accent-color);
  --metadata-input-background-active: var(--accent-color-trans);
  --tag-color: var(--accent-color);
  --tag-background: var(--accent-color-trans);
  --pill-cover-hover: color-mix(in srgb, var(--accent-color) 60%, transparent);
  --background-modifier-border-focus: var(--accent-color);
  --background-modifier-border: var(--accent-color-trans);
  --background-modifier-hover: color-mix(
    in srgb,
    var(--accent-color) 60%,
    transparent
  );

  color: var(--accent-color);
  background-color: var(--page-color);
}

/* ----------------------- Manila/Tan Page Background ----------------------- */
/* Defaults to Black Pen */
.page-manila {
  --page-color: var(--page-manila);
  --accent-color: var(--pen-black);
  --accent-color-trans: color-mix(
    in srgb,
    var(--accent-color) 15%,
    transparent
  );
  --image-effect: brightness(0) saturate(100%) invert(14%) sepia(19%)
    saturate(296%) hue-rotate(5deg) brightness(90%) contrast(96%);
  color-scheme: light;
}
.embed-manila img {
  background-color: var(--page-manila);
}

/* --------------------------- White Page Background ------------------------ */
/* Defaults to Black Pen */
.page-white {
  --page-color: var(--page-white);
  --accent-color: var(--neutral-pen-black);
  --accent-color-trans: color-mix(
    in srgb,
    var(--accent-color) 15%,
    transparent
  );
  --image-effect: brightness(0) saturate(100%) invert(14%) sepia(19%)
    saturate(296%) hue-rotate(5deg) brightness(90%) contrast(96%);
  color-scheme: light;
}
.embed-white img {
  background-color: var(--page-white);
}

/* -------------------------- Blueprint Styled Page ------------------------- */
/* Defaults to White Pen */
.page-blueprint {
  --page-color: var(--page-blue);
  --accent-color: var(--pen-white);
  --accent-color-trans: color-mix(
    in srgb,
    var(--accent-color) 15%,
    transparent
  );
  --image-effect: brightness(0) saturate(100%) invert(89%) sepia(1%)
    saturate(2714%) hue-rotate(196deg) brightness(107%) contrast(98%);
  color-scheme: dark;

  --link-color: color-mix(in srgb, var(--pen-light-blue) 60%, var(--pen-white));
  --link-color-hover: color-mix(
    in srgb,
    var(--pen-light-blue) 20%,
    var(--pen-white)
  );
}
.embed-blueprint img {
  background-color: var(--page-blue);
}

/* Adds a grid layout on page background */
.page-grid {
  background-image: linear-gradient(
      0deg,
      transparent 0px,
      var(--accent-color-trans) 1px,
      var(--accent-color-trans) 2px,
      transparent 3px
    ),
    linear-gradient(
      90deg,
      transparent calc(var(--grid-size) - 3px),
      var(--accent-color-trans) calc(var(--grid-size) - 2px),
      var(--accent-color-trans) calc(var(--grid-size) - 1px),
      transparent var(--grid-size)
    );
  background-size: var(--grid-size) var(--grid-size);
}

/* ------------------------------- Pen Colors ------------------------------- */
/* Image Effects generated with:
    https://angel-rs.github.io/css-color-filter-generator */

/* Callouts */
:is(
    .page-white,
    .page-manila,
    .page-blueprint,
    .pen-white,
    .pen-blue,
    .pen-red,
    .pen-green,
    .pen-black,
    .pen-gray,
    .pen-purple
  )
  :is(.callout > .callout-title, svg) {
  color: color-mix(in srgb, var(--accent-color) 60%, transparent);
}

:is(.page-manila, .page-white, .page-blueprint) .callout {
    background-color: var(--accent-color-trans) !important; 
}

/* Code Blocks */
:is(.page-white, .page-manila, .page-blueprint) :is(code,
.HyperMD-codeblock, .cm-inline-code) {
  --code-normal: var(--accent-color);
  --code-background: color-mix(
    in srgb,
    var(--page-color) 80%,
    black
  ) !important;
}
:is(.page-white, .page-manila, .page-blueprint) div > pre {
  --code-background: color-mix(
    in srgb,
    var(--page-color) 80%,
    black
  ) !important;
}

:is(.pen-white, .pen-blue, .pen-red, .pen-green, .pen-black, .pen-gray, .pen-purple):not(.page-manila):not(.page-white):not(.page-blueprint) :is(code, .HyperMD-codeblock, .cm-inline-code) {
  --code-normal: var(--accent-color);
}

/* Tables */
:is(.pen-white, .pen-blue, .pen-red, .pen-green, .pen-black, .pen-gray, .pen-purple, .page-manila, .page-white, .page-blueprint) table th {
  color: var(--accent-color);
  font-weight: bold;
}

/* ------------------------------- Pen Colors ------------------------------- */

.pen-white {
  --accent-color: var(--pen-white);
  --accent-color-trans: color-mix(in srgb, var(--pen-white) 15%, transparent);
  color: var(--accent-color);
  --hr-color: var(--accent-color);
  --image-effect: brightness(0) saturate(100%) invert(89%) sepia(1%)
    saturate(2714%) hue-rotate(196deg) brightness(107%) contrast(98%);
}
.pen-blue {
  --accent-color: var(--pen-blue);
  --accent-color-trans: color-mix(in srgb, var(--pen-blue) 15%, transparent);
  color: var(--accent-color);
  --hr-color: var(--accent-color);
  --image-effect: brightness(0) saturate(100%) invert(36%) sepia(95%)
    saturate(945%) hue-rotate(199deg) brightness(95%) contrast(95%);
}
.pen-red {
  --accent-color: var(--pen-red);
  --accent-color-trans: color-mix(in srgb, var(--pen-red) 15%, transparent);
  color: var(--accent-color);
  --hr-color: var(--accent-color);
  --image-effect: brightness(0) saturate(100%) invert(40%) sepia(41%)
    saturate(1024%) hue-rotate(316deg) brightness(99%) contrast(94%);
}
.pen-green {
  --accent-color: var(--pen-green);
  --accent-color-trans: color-mix(in srgb, var(--pen-green) 15%, transparent);
  color: var(--accent-color);
  --hr-color: var(--accent-color);
  --image-effect: brightness(0) saturate(100%) invert(52%) sepia(60%)
    saturate(2521%) hue-rotate(105deg) brightness(96%) contrast(84%);
}
.pen-black {
  --accent-color: var(--pen-black);
  --accent-color-trans: color-mix(in srgb, var(--pen-black) 15%, transparent);
  color: var(--accent-color);
  --hr-color: var(--accent-color);
  --image-effect: brightness(0) saturate(100%) invert(14%) sepia(19%)
    saturate(296%) hue-rotate(5deg) brightness(90%) contrast(96%);
}
.pen-gray {
  --accent-color: var(--pen-gray);
  --accent-color-trans: color-mix(in srgb, var(--pen-gray) 15%, transparent);
  color: var(--accent-color);
  --hr-color: var(--accent-color);
  --image-effect: brightness(0) saturate(100%) invert(35%) sepia(13%)
    saturate(189%) hue-rotate(5deg) brightness(96%) contrast(86%);
}
.pen-purple {
  --accent-color: var(--pen-purple);
  --accent-color-trans: color-mix(in srgb, var(--pen-purple) 15%, transparent);
  color: var(--accent-color);
  --hr-color: var(--accent-color);
  --image-effect: brightness(0) saturate(100%) invert(33%) sepia(59%)
    saturate(2620%) hue-rotate(249deg) brightness(98%) contrast(93%);
}

.pen-white, .pen-blue, .pen-red, .pen-green, .pen-black, .pen-gray, .pen-purple {
  --checklist-done-color: var(--accent-color);
}

I believe it may be this line:

:is(.page-manila, .page-white, .page-blueprint) .callout {
  background-color: var(--accent-color-trans) !important;
}

What I believe may be happening is the !important prevents default style on callouts in reading mode on light pages, the callout is probably there but just blends into the page, so it looks like it disappears. Live Preview uses a different styling path, so they should still show up there.

This is also outlined in the devdocs.