This bug is related to the ITA language pack of Scrivener. I took me a while to me to understand why this wont work:
This
should be formatted to something like “thursday, 2021”, but instead I get “thursday,”
The hint text suggests to use “aa” for the year portion of the date. Then, I thought about “year” being usually expressed as “yy” and changing the format to “EE, yyyy” finally worked.
So, to keep it short, the language pack incorrectly translates the year format.
Thanks