[wp-trac] [WordPress Trac] #64770: The new block level custom CSS breaks when edited by user without unfiltered_html

[WordPress Trac]

#64770: The new block level custom CSS breaks when edited by user without
unfiltered_html
--------------------------+-----------------------------
 Reporter:  glendaviesnz  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  high          |  Milestone:  Awaiting Review
Component:  Canonical     |    Version:  trunk
 Severity:  critical      |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 https://github.com/WordPress/gutenberg/pull/73959 introduced block level
 custom CSS.

 Everything works as expected unless a user without unfiltered_html edits a
 page/post with block level custom CSS that includes nested selectors, eg.

 ```
 color: green;
 & p {color: blue}
 ```
 In these cases, entities like & are encoded and the CSS breaks in the
 editor and the frontend.

 This is caused by KSES filtering in core, not in Editor codes, so filing
 here, not in the GB repo.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64770>
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