I experienced the exact same symptoms when I upgraded to 5.7.0. Field Groups out of their expected context, and those spinners. Same version of WP also. I just backed out of the update figured I’d wait and see if there is a 5.7.1 released soon.
thanks to another user on this forum, I realised that I’d caused this issue by loading all scripts including jQuery with the ‘defer’ tag.
the code, which filters all enqueued scripts now looks like this:
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