[2021] EU4 Saves not showing up. [MacOS]

If they were local saves they'd be in Documents/Paradox Interactive/EU4/save games/ . If cloud saves in:

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Do you see them existing in either place?  

Save file not showing means they are corrupt. But I can't explain how more than one file could be corrupted at once, that points to some external agency.

Do you have access to any other computer to test them on?  

That's a valid question to which I have no good answer, I'm afraid.

You don't have any sort of antivirus app active on this machine I assume? Generally Macs don't, but it's possible.

If you make cloud saves instead of local, does this still happen?