Annoying SFM Error destroying 2 days of progress (Patreon)

For the sake of documentation and to give myself a hard reminder to switch softwares ASAP, I would like to share an error that I had happening back in 2020 as well as I worked on Demonic Mirror where I've lost several hours of workload too. I think this is also interesting for the few SFM artists in here that are supporting me as well.

I do not know why this error happens and no one else on the internet seems to know either.. I'm glad the auto-save function prevented more progress being lost.

The issues I have with SFM are manyfold - Aside from the random crashes, the technical limitations, the amount of work that has to be put into in order to make things look passable and now the constant fear that project files may get corrupted? That's a big oof for me.

I was considering if DM2 should be made with SFM as well and with that error happening I conclude: Probably not.