I was afraid of that. When I use safe mode disabling unofficial it still does this, but when I disable all plugins the issue goes away. Then I tried disabling all other official plugins except calendar in /admin/plugins and it still happens. I also cannot duplicate this on my sandbox so it seems to be something specific with my site and the calendar plugin. I also get this error when enabling calendar Unable to configure link to 'Calendar'. Ensure ad-blockers are disabled and try reloading the page. and ublock is disabled.
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