In case it’s helpful, I just looked into this more and think it has something to do with the way Obsidian renders the live preview mode — these glitchy indentations in checklists seem to go away when I a) check and uncheck the checkbox, b) turn on and off a CSS snippet, c) turn off and on an option in the “editor” section of the settings. And the glitches often show up again when I scroll quickly through a long list of checklist items, when the legacy editor mode shows for a moment before the live preview renders on top of it.