Mac Mail not syncing to Gmail server
I have a MacBook Air running Mojave 10.14.6. Suddenly, as of a few days ago, actions I take within the Mac Mail client are not reflected on the Gmail server, and consequently don't get communicated to the mail app on my iPhone 8. New email comes in to both apps just fine, but email that I read or delete within Mac Mail does not show as read or deleted in the webmail interface for the Gmail account, and consequently shows the same on the iPhone. At first I thought this was a problem with the phone, since it coincidentally started right after updating to iOS 14.2, but it's now clear that's not the case.
Is there any point in my opening up an Apple Support ticket for this? Is this more likely to be an issue specific to me, and thus perhaps solvable by removing and re-connecting the account in Mac Mail? Or is this more likely to be on their end, just one of those periodic ******* contests between tech titans and their servers that will eventually work itself out?
MacBook Air 11″, 10.14