My site is using a custom plug-in for testing right now. It is updated to latest. Not able to link to it at the moment. There’s some Jquery in that plug-in that is not being loaded on my site on safari. Everything loads fine on chrome.
The errors in the inspector in safari happen on both Meta and my site.
UPDATE: Looks like this is related to the Enable Content-Security-Policy setting on the site.
When I disable it, the errors seem to go away (and, sorry for the confusion, looks like the jQuery thing was an unrelated issue). In my desktop safari, the errors show up even with the meta site. So in some way Safari (at least mine, OS 10.15.4) just doesn’t like the content security policy setting. But it looks like performance is probably unaffected.