Totally strange and new to me.
Can it be considered that stock FPOS will do the same way of “factory reset” than LineageOS?
Is there any official statement available on that way FP2 performs its factory reset from FP?
Usually this is some kind of basic last resort task to do before giving up which, in the past, usually could save someones neck.
I tend to claim this is a FP2 specific occurrence.