Heroic (epic) games are lagging, flashing screen.

Steam games are completely fine tho.

What I did:
1) Upgraded Bazzite from gaming mode.
2) Updated Rocket League from Heroic launched by Steam Gaming mode.
3) Every Heroic game behaves just like RL, Steam games are normal.
4) Tried to change proton version, didn't work.

Meanwhile I restarted 3-4 times and launched it from desktop mode, nothing worked.

Also, I tried to return PCBS cuz I played <2h and I didn't like it so I returned it, it worked. Could this be a problem?
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