Screen flickering on both sides in Standalone/Packaged build only

[Paradoxical95]

Hey all. Need some help.
I noticed today after I build my game that this flickering is happening. It was also present when I ran the game in standalone mode but not in Editor mode. Idk why it’s happening.

Last time I built my game, this was not happening and that was 15 days ago. Since then, I haven’t changed any rendering related thing, only code based. I did switch on GPU scheduling in Windows but I reverted it and the issue still persist. The only thing I can think off was to change DLSS preset to “E” for all quality modes in Project Settings, which I did revert to default and nothing happened. Still the same flickering.

This is a bit confusing. Haven’t changed any driver or anything else. Idk how to fix this. This is really random.

[Paradoxical95]

Okay so I did some diagnostics thinking it might be one of the upscalers (TSR, TAAU, DLSS, XeSS or FSR) and it’s FSR. Somehow the game defaults to it (altho default was TSR) and switching to any of the other 4 or even switching to FXAA/MSAA removes that flickering instantly.

Edit - it seems to be the RHI or the D3D12 Backend from FSR3. It was enabled in project settings but FSR itself was disabled. The command was FSR3 OverrideSwapChain I guess. Switching the backend OFF but letting the RHI be ON somehow fixed it.