Fix: Unregistering a block type causes blocks that convert to it to break the editor #12192
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When a block was registered, if we added another block that transformed to it and went to the block switcher the editor may crash.
Fixes: #12001
How has this been tested?
I added a list block.
I remove the quote block:
wp.blocks.unregisterBlockType( 'core/quote' );
.I went to the switcher of the quote block, I see the application did crash and the transform to paragraph was available.
I started again; I added a list block; I opened the block switcher; I checked quote and paragraph are available as transforms; I opened the console with the switcher opened, I remove the quote block:
wp.blocks.unregisterBlockType( 'core/quote' );
and I verified the quote block transform disappeared.