You'll notice
Useful2 Signal3
Plugin UI hooks can only draw five element types; anything else is reported as a hook error.
What's wrong with this entry?
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What
A plugin hook that draws UI can build elements only from Box, Text, div, span and b, plus lowercase box and text aliases. Anything else throws inside the plugin's sandbox, so Claude Code reports it as a hook error rather than trying to render it.
Details
- Keys, refs and props whose value is null are stripped from the element before it is frozen.
- This applies to every render hook on this build; there is no setting to widen the tag set.
Evidence
a render hook draws those and what next(e) returned
Strings lifted out of the shipped bundle, so the claim above can be checked against them.