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I'm using Sony PS5 Controller on PC and vibration doesn't work in PCSX2.

Yeah it won't work for a while still. The vibration on that controller works differently, even using it on PC games is hit and miss. The DS4 had the same issue for a while.

I assume you're running PCSX2 through Steam? I use a DS4 and vibration works fine afaik, not sure about DS5 however. Best I can say is to re-bind vibration in Lilypad and see if it helps.