I also have the exact same issue. OpenGL fixes it, but it used to work a feww weeks ago when I last tried it on MY LCD Steam Deck. I’ve since then switched to OLED, and I don’t know if if it’s the OLED Deck that has this issue or if it occurs on the LCD as well. I cannot test that, because I’ve sold the older Deck.

I have the same issue. I’ve been encountering it since I’ve upgraded to my new OLED. OpenGL works.

Vulkan used to work when I last tried it a few weeks ago on my LCD Steam Deck.