Let’s try to eliminate factors such as paths, filters, typos, etc., to figure out what could be the cause.
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When you embed your base in a note like
![[example.base]], does the base work? (You said “when dragged into a note”, so I’m just making sure we’re talking about the same thing.) -
But that same base in the sidebar with the same active note doesn’t work?
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Is all of this is on the same device?
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Are you displaying the base in the left or right sidebar, not in the main workspace in a way that happens to be a tab beside another tab? As in, when you toggle the sidebar closed, the base closes with the sidebar? (Sorry if it sounds like a silly mistake, but someone has made it before!)
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Since you’re getting different results in different vaults: Have you tried turning on restricted mode (or if you’re on mobile, disabling all plugins and restarting Obsidian) and also disabling all snippets and switching to the default theme? Just to confirm none of those are acting up.
If you feel like sharing the base code and any relevant properties and paths, someone might be able to spot more areas to investigate.