[wp-trac] [WordPress Trac] #54590: Bug in footer of full site editing WP 5.9 Beta 1

[WordPress Trac]

#54590: Bug in footer of full site editing WP 5.9 Beta 1
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 Reporter:  ejca              |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 Hello. I have installed WordPress 5.9 Beta 1.

 When I edit the footer, I have added a button and, when I try to remove
 it, the system returns an error. I attached video:
 [https://drive.google.com/file/d/1CnneSjz6pt9d1yfeahbBw0VRjUgILVvy/view?usp=sharing]

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Ticket URL: <https://core.trac.wordpress.org/ticket/54590>
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