Fix: Server side rendered blocks are not parsed on the widgets screen. #15414
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Description
Server-side rendered blocks are not being correctly parsed on widgets screen making legacy widget blocks not load correctly on #15074.
The problem was that the server side block definitions were not being bootstrapped on the widgets page.
How has this been tested?
I went to the widgets page http://yah.local/wp-admin/admin.php?page=gutenberg-widgets.
I pasted
wp.blocks.parse('<!-- wp:latest-posts {"postsToShow":34,"displayPostDate":true} /-->');
on the developer tools command line.I verified the attributes were correctly parsed on the return value.