I’m no an expert but it looks like something has gone wrong in the build process if you look at the release diff.
As an example, admin/build/static/css/8.8fbf84c5.chunk.css appears to be a copy of the stock WordPress file /wp-includes/css/dist/components/style.min.css and this is causing a lot of issues with the editor as it messes with the intended CSS order.
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This reply was modified 4 years, 10 months ago by clamburger.