[wp-trac] [WordPress Trac] #51442: Cannot add youtube links since Gutenberg update to 9.1.0

[WordPress Trac]

#51442: Cannot add youtube links since Gutenberg update to 9.1.0
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 Reporter:  yeoric        |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:  5.5.1
 Severity:  major         |  Resolution:
 Keywords:                |     Focuses:
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Comment (by yeoric):

 OK, last update, I hope. Problem persists. I re-checked with default theme
 and all plugins off (did that before, but did it again just to be sure).
 I managed to add 4 embed blocks with youtube videos (2 50:50 columns
 blocks with 2 videos each). This worked, after a few tries. I failed
 consistemtly when trying to add another columns block and adding videos,
 or even when trying to add a paragraph containing a youtube link (as
 before); Gutenberg would throw the JSON error and would not update.
 I created another post using Gutenberg, with 1 columns block, as I tried
 above. Switched to Classic, copied the block in text mode, included this
 in the original post, updated.
 Post now shows all 6 videos as intended (3 rows of 2 veideos each).
 Gutenberg still cannot update the block and *immediately* shows "You
 cannot embed this …" for each video, plus the JSON error, the moment I
 edit the post.
 Workaround found. Contact me if there are any q.s or if you need site
 access.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51442#comment:5>
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