[wp-trac] [WordPress Trac] #63765: register_block_pattern() returns true even when disallowed blocks are used, causing silent failure in the editor.

[WordPress Trac]

#63765: register_block_pattern() returns true even when disallowed blocks are used,
causing silent failure in the editor.
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 Reporter:  tusharbharti  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  6.8.2
 Severity:  normal        |   Keywords:
  Focuses:                |
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 == Description ==
 This issue was initially reported in the Gutenberg GitHub repo
 (https://github.com/WordPress/gutenberg/issues/59413).

 When registering a block pattern using `register_block_pattern()`, if the
 pattern includes blocks that are not explicitly allowed via the
 `allowed_block_types_all` filter, the function still returns `true`.
 However, the pattern does not appear in the editor's pattern inserter, and
 no warning or error is shown.

 This behavior is inconsistent. For example, the `core/column` block is
 usable inside the editor if `core/columns` is whitelisted, even without
 explicitly allowing `core/column`. But when used in a pattern,
 `core/column` must be separately whitelisted, or the pattern is silently
 skipped.


 == Steps to Reproduce ==
 1. Use `allowed_block_types_all` to only allow `core/columns`.
 2. Register a pattern containing both `core/columns` and `core/column`.
 3. Visit the editor and open the pattern inserter.
 4. The pattern will not appear, though `register_block_pattern()` returned
 true.

 == Expected Behavior ==
 - Either register_block_pattern() should return false or log a warning
 when the pattern includes disallowed blocks.
 - Or nested blocks (like core/column) should be implicitly allowed when
 their parent (like core/columns) is whitelisted, for consistency.

 == Actual Behavior ==
 - register_block_pattern() returns true.
 - The pattern does not appear in the inserter.
 - No error or warning is provided.

 == Proposal ==
 Add block-type validation to `register_block_pattern()` that checks
 pattern content against the current block whitelist
 (`allowed_block_types_all`). If disallowed blocks are found, return
 `false` or trigger a developer warning.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/63765>
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