[wp-trac] [WordPress Trac] #52031: Error when clicking Convert to regular blocks

[WordPress Trac]

#52031: Error when clicking Convert to regular blocks
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 Reporter:  jeffabailey   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:  5.6
 Severity:  blocker       |  Resolution:
 Keywords:                |     Focuses:  javascript
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Comment (by jeffabailey):

 Hello, I switched the theme to Twenty Twenty-One and tried to convert the
 reusable block, and the same error occurred.

 I saved a new reusable block with just a paragraph, and that worked fine.

 I then removed the Ultimate Blocks -> Table of Contents block from my
 reusable block and saved it. I was then able to use the reusable block
 without issue.

 It appears that the issue has been isolated to the Ultimate Blocks ->
 Table of Contents block.

 [[Image(https://i.imgur.com/wnbZp57.png)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/52031#comment:8>
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