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webwordpresserrorerrorwarningvalidationextensionplugin•star_halfUncommon•warningModerate

Invalid block pattern content

The editor shows the error when it cannot parse a block pattern. This happens when the pattern definition is malformed or the HTML inside it is invalid.

You encounter the error if a plugin or theme supplies a broken pattern, if a cached pattern is corrupted, or if a dynamic block returns an error during rendering.

Symptoms

[dashicons-warning]
Editor banner shows error
A red banner appears in the block editor with the message Invalid block pattern content.
[dashicons-no]
Pattern fails to load
The pattern shows as a comment placeholder and does not render in the editor.
[dashicons-list-view]
Missing from inserter
The pattern is absent or marked unavailable in the block inserter.
[dashicons-admin-tools]
Console errors
Browser console logs Gutenberg messages about invalid block pattern content.

Common Causes

Malformed block.json
Missing required keys or invalid JSON syntax breaks registration.
Invalid HTML in pattern
Unclosed tags or unsupported attributes prevent the editor from parsing the content.
Corrupted pattern cache
Stale transients store malformed data that the editor reads.
Plugin or theme conflict
Another plugin or theme deregisters core blocks or filters block patterns incorrectly.
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