Why am I periodically receiving an error stating that adding to Google Sheets would exceed the cell limit, despite the sheet being far from the alleged limit?

user-1 (User 1) January 22, 2024, 8:32pm 7

Posted thread to Discourse: Why does Google Sheets Upsert function sporadically show an error about exceeding cell limit when the sheet doesn't have near 10,000,000 cells?