Chain slip causes bent derailleur
I crashed a couple days ago before the derailleur got bent and after the crash, I realized that when I try to shift to the big sprocket stationary, it sometimes will slip off and goes to the back of the cassette:


It sounds like the derailleur was already damaged in this crash, causing the shifting to be off. Perhaps the hanger got bent, causing the cage to point inward, throwing the entire shifting alignment in the direction of the wheel hub, thereby allowing the chain to derail from the largest cog. This is a bad situation if, additionally, the derailleur makes contact with the spokes.

In this situation, the lower limit trim screw won't help, because its action plays out in the pivot mechanism above the cage.

If you're prone to damaging your derailleur, consider installing a derailleur guard.