Although we didn't do any changes, this new error appeared in the GSC Structured Data section:
I don't really get what it means. There are many fields for Schema.org, is
homeLocation suddenly a required field? Does that make any sense?
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There was a known glitch on Google's side of things which has now been addressed. It was temporarily being marked as a required field now it has been corrected with Google as
homeLocation is not required. It may take some time for the errors to disappear from the error report but this has been resolved by Google.
Thanks @mayrop for the link.