[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):

 Oomph. The real problem seems to lie in a completely unexpected place. My
 provider hosting WordPress is Strato (strato.de), and they seem to have a
 security feature in place that I did not connect with WordPress. See here:
 https://wordpress.org/support/topic/updating-failed-error-message-the-
 response-is-not-a-valid-json-response/page/3/#post-13497799 . Their
 "guestbook spam filter" seems to filter post and page updates **if they
 come from Gutenberg** (not if they come from the Classic editor).
 The question remains: Why would WordPress send updates from the block
 editor in a format that could conceivably mistaken for a post or guestbook
 entry?
 I communicated the problem to Strato, but without much hope for change.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51442#comment:6>
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