allowed_block_types breaks if array keys become non-sequential

[gyrus]

When the blocks array is filtered using allowed_block_types, I want to remove some blocks.

Using a loop and a combination of array_search() and unset(), I remove the blocks I need to remove.

However, it seems that this results in all blocks being available (the same as returning true for allowed_block_types).

This can be easily averted in your own hooked function by using $blocks = array_values( $blocks ) to reset the array keys so they're sequential again.

However, this seems like a minor bug worth fixing at root for anyone else removing blocks this way (apply array_values() to the array if an array is returned by the allowed_block_types filter).

Not sure if this might be affected by decisions made for https://core.trac.wordpress.org/ticket/50706