If there is a resource that can’t be loaded, then either the permissions are set wrong or it isn’t there.
If you can try with no plugins, or use the Health Check plugin which lets you deactivate plugins for just for you to test, that would give more information. Another thing to try is the Classic Editor plugin, to determine if it’s the editor or something else.
My guess is if you've done all the basics, it's probably a plugin or theme causing the issue.
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