LG TV Artifacts on Big Picture Mode

Hey guys, when I connect my PC to my LG TV (dunno if it's related) and turn on gaming mode, lots of artifacts show up, making it unusable. I have tried it on my monitor and all is ok, no issues there.
My TV is an LG QNED87T6B. I've tried different HDMI cables, inputs and nothing seems to work. This issue only happens on big picture mode, if I switch to desktop mode, there are no issues. Also, when I connect to Bazzite via Moonlight, everything is ok.

Also, dunno if it's relevant or not. I've tried this with an RTX 3080 and an RTX 3080 Ti and had the same occurence with both GPUs. I've also tried HDR on/off, happens on both settings
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