Part of #41236.

Currently in WordPress core the follow lines appear.

// Preload server-registered block schemas.
wp_add_inline_script(
	'wp-blocks',
	'wp.blocks.unstable__bootstrapServerSideBlockDefinitions(' . wp_json_encode( get_block_editor_server_block_settings() ) . ');'
);

This was a workaround added in WordPress 5.0. Now that the block types endpoint was added in #21065 , this should be used as the "point of truth" for block definitions.

Describe the solution you'd like
The block types api should be preloaded on the page by adding it to this array.