[wp-trac] [WordPress Trac] #56291: Theme JSON: Fix notice when unknown elements are specified

[WordPress Trac]

#56291: Theme JSON: Fix notice when unknown elements are specified
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 Reporter:  scruffian                |       Owner:  (none)
     Type:  defect (bug)             |      Status:  new
 Priority:  normal                   |   Milestone:  Awaiting Review
Component:  General                  |     Version:
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:
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Comment (by rudlinkon):

 @audrasjb here is the instruction here
 https://github.com/WordPress/gutenberg/issues/42649 could you please
 follow this instruction?

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Ticket URL: <https://core.trac.wordpress.org/ticket/56291#comment:8>
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