[wp-trac] [WordPress Trac] #59583: Patterns: `theme` attribute not inserted in Template Part blocks

[WordPress Trac]

#59583: Patterns: `theme` attribute not inserted in Template Part blocks
-----------------------------+-----------------------------
 Reporter:  Bernhard Reiter  |      Owner:  Bernhard Reiter
     Type:  defect (bug)     |     Status:  assigned
 Priority:  high             |  Milestone:  6.4
Component:  General          |    Version:
 Severity:  major            |   Keywords:
  Focuses:                   |
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 First reported by @scruffian in
 https://github.com/WordPress/gutenberg/issues/55202.

 [56805] introduced a regression: The `theme` attribute is no longer
 injected into Template Part blocks inside of patterns. This causes errors
 on the frontend, where instead of a given template part, an error message
 such as `Template part has been deleted or is unavailable: header` is
 seen.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59583>
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