Its an open world 3D game with realistic graphics, its going to demand a fair amount of RAM but it never exceeded 5GB RAM usage on my system and never pulled more no matter what i do or how long i play, i have simulated this while keeping a keen eye on the RAM all through the game session .
My system is a quad core cpu, gtx980, 16GB RAM DDR3.. I dont think yours can be worse.
I will try to get my hands on a system with GTX1650super and see if i can replicate the issue you faced.. Thanks so much for the feedback and heads up on performance. I will look into it.