Solutions
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z0ki's post in [SOLVED] HDMI losing signal with VM on odd occasions was marked as the answerSo this is embarrassing.
The issue was the HDMI cable is not a HDMI 2.1 or (2.0 i believe) hence I was losing signal. Tested with a known HDMI 2.1 cable and viola! Picture.
I been ripping my hair out over this for days thinking something in my VM or an issue with GPU passthrough has been happening but nope. Just my idiocy lol.