Have same issue. UE 5.3.2, Paper2D, Not the dymanic material instance but “Set material parameter” to change color of a Paper2D Sprite. Engine crash randomly after quitting PIE preview. seems it will crash when you quitting and a parameter changed in same tick.
Scratching my head for days and still have no solution. Dev guys should really fit some Paper2D bugs. Reported and waiting.
For me it just crash in engine, standalone or build game are stable without problem, But still very annoying at working.