Blank Fiscal Year and Period record in GL_PeriodPostingHistory

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Have had 2 clients in the last two weeks come up with mysterious beginning balances on accounts as of the first fiscal year in history.  Digging into DFDM, I've found a posting with a BLANK Fiscal Year and Period in both cases.  In neither case could I find an entry in GL_DetailPosting with a blank year/period.  One client is on 2019, the other is on 2020.  One case was an entry made in Dec that reversed in Jan, and was probably the first posting made in the new fiscal year.  I'm thinking in both cases the fiscal year did not exist before the offending entry was posted, and the entries did post correctly in 2021, AS WELL AS making the post to the blank year/period.