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Editor won't work at all (plugin conflict Yoast SEO 8.1 and Gutenberg 3.7, fixed in Yoast SEO 8.1.1) #9506
Sorry for the issue, yes there's a pending fix in the Yoast plugin that will be hopefully released on Monday.
The bug happens when trying to open the "Categories" panel in the Gutenberg sidebar. As a temporary workaround I would suggest: temporary disable Yoast SEO, then edit a post in Gutenberg and close the Categories panel. Then you can safely re-activate Yoast SEO and edit posts, as long as you don't re-open the Categories panel