There’s a bug with my extension, kiwiphoenix364/pxt-mini-tilemaps where if you reload the page/switch to js and back, the category of blocks dissapears even though the extension file is still there.
I believe this will fix it https://github.com/kiwiphoenix364/pxt-mini-tilemaps/pull/1 if you merge then bump the extension
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Thx @jwunderl !