This happened to me yesterday:
I had to complete a resiliency test on our infrastructure and submit it to auditors for compliance reasons. I ran the tests, got the results, and I have to put it into a report. The report is like 30 pages long or more, but very little changes between each test (we do them quarterly). So I only usually change a few tables with the new report results, and freeflow some commentary in the discussion section that is unique for that run, so that the auditor feels special.
Anyway, I open up the previous quarter's report. I edit a bunch of data, write a bunch of useless commentary and go to "Save As" with the Q1-2024 suffix, and I realize the Word document had been autosaving my work the whole time on top of the Q4-2023 report. Urgh, very annoying. I didn't save intentionally because I knew I would save a copy later.
I was able to restore the old version through revision history, but still annoying nonetheless.