No theme is being used. I started with a fresh theme.json and index.html, etc. I created / built up my own theme to better understand block theming. Eventually, when I reached the point of defining styles through the theme editor I started using the Create Block Theme plugin to write the changes to the theme files.
The issue happens when I set custom heading styles through the editor and then write the changes to the file system using the plugin. The changes to the heading styles set in the theme.json ( styles.elements.h[level].typography.fontSize) breaks the editor display so that the headings in the editor only display as the default paragraph size. The front-end display is correct, though.
It’s not a plugin problem. These are simply changes to the theme.json. Wouldn’t matter if I made the edits manually or with the plugin.
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This reply was modified 12 months ago by jmbod.