Formatting issue appears plugin-specific but may involve core format handling.
The issue involves text formatting applying to individual characters in a specific plugin context, possibly related to format registration changes in WordPress 5.9. While maintainers couldn't reproduce it recently, the original report suggests a real interaction pattern that needs investigation. The main blocker is determining if this is still reproducible with current versions.
This appears to be a bug introduced in WordPress 5.9. I have a plugin that adds a screen reader only text format and then highlights the content with the markup in the WordPress editor while hiding the content visually on the front end.
This worked previously, but it was reported to me last night that this has started highlighting each individual character. It seems this happens when selecting the screen reader text format, then typing. If one types the content, highlights it, then selects the text format, it applies to the whole block of text.
The first content will be wrapped in a single span and highlight the content correctly. The second content will wrap each character individually.
note: Did not check "Please confirm that you have tested with all plugins deactivated except Gutenberg." because Gutenberg is not active and the Screen Reader Text Format plugin is highlighting the issue with the text format applying the span to individual characters.
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