Animate didn't register progress after a file overwrite

I've been working on an animation and I came to a point where I clicked "saved as" to rename the file and overwrite a previous version. There was a pop-up which even clarified whether I wanted to overwrite the file and I clicked OK.

Just before closing my computer, I clicked save just in case. I opened it in the morning and everything looked normal. However, the program was frozen and glitched out so I had to close it. When I reopened the file, everything after what I assumed to be the time I overwrote the file the night before hadn't registered. I looked through my files, and all of them said last changes happened around 11pm, even though I saved my final version around 2am.

Hours of work on an assignment are gone, I can't find any information on this specific problem and don't understand what went wrong. Is there a way to retrieve it, or a way to avoid this again?