[wp-trac] [WordPress Trac] #59472: Beta 1: Edit post shows block validation failed for `core/heading`

[WordPress Trac]

#59472: Beta 1: Edit post shows block validation failed for `core/heading`
---------------------------------------+------------------------------
 Reporter:  mukesh27                   |       Owner:  (none)
     Type:  defect (bug)               |      Status:  new
 Priority:  normal                     |   Milestone:  Awaiting Review
Component:  Editor                     |     Version:  trunk
 Severity:  normal                     |  Resolution:
 Keywords:  needs-patch needs-testing  |     Focuses:  administration
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Comment (by andrewserong):

 I wonder where this is coming from? I can see the warning, too. If I
 manually copy in markup that includes the block comment specifying the
 correct heading level, it seems to work okay for me in 6.4:


 {{{
 <!-- wp:heading {"level":1,"className":"screen-reader-text"} -->
 <h1 class="wp-block-heading screen-reader-text">Posts</h1>
 <!-- /wp:heading -->
 }}}


 Could there be a block pattern (or preview) somewhere that has illegal
 markup or is missing the `level` in the block comment delimiter?

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Ticket URL: <https://core.trac.wordpress.org/ticket/59472#comment:2>
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