G4 PS5 Slim HDMI 2.1 not being recognized.

I am having an issue where my PS5 isn't recognizing hdmi 2.1 connection directly into G4 (not through an avr) today all of a sudden, insisting it is hdmi 2.0.

I have XSX hooked up to the same TV, and it's working fine at 4k120hz. I changed the cables from XSX to PS5 and PS5 still hasn't seen 4k120hz. I put the cables back to xbox and all is fine there.

I am doing a factory reset on PS5 now, but I also saw in youtube some people with G4 as well were able to correct this by reconnecting hdmi cables, which didn't work for me. somehow I couldn't reset the monitor info on the ps5, it's getting cached or something.

I am guessing it's a bit of PS5 and G4 issue together. Does anyone have any experience or suggestions?

I tried toggling tons of settings in gamer mode or outside, none seems to have worked.

Edit: I tried connecting a PS5 pro, same issue, only recognizing hdmi 2.0. There's a clear handshake issue with G4. This PS5 Pro is connecting to Samsung S95D fine. Then again my XSX is connecting to both fine.

Including below the link to the issue on youtube, which I reckon is similar to mine.

https://www.youtube.com/watch?v=W_6pjNwwYhs&ab_channel=QuikSandTV