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Sorry for late reply, but seems like you may have found the issue. I apologize i wasn't able to provide the solution but glad you were able to get it fixed!

You said this use to work. Do you possibly have to re-enable above 4g decoding in the bios? Does that video card require audio to be passed thru as well, cuz i see no audio devices on ur xml. Many nvidia cards needs multifunction enabled to work properly. According to your xml you dont' have the arguments used to set the memory allocation for larger nvidia cards, which if you don't can cause issues. I don't remember it exactly but essentially you have to make ur pci memory larger to accommodate the large nvidia card. You are running windows 11 on i440x? That may be the whole issue right there, windows 11. If you are hardware limited, maybe use windows 10. Or goto q35 for windows 11. That may be the whole issue tho. I really think you need q35 and maybe make a new vm w/ that first. I think if you google referenced into ai/google/ you would get the specific commands. But thats my initial take.

I don't know how much help i can be but i do have a working windows 10 vm, with intel 4th gen intel 4785t with working passthrough that i have used for transcoding in plex. I know this is a late reply. . . but are you wanting to remove ur igpu from your windows vm, then allow it to be used in a plex docker? Or are you running your plex server inside your windows 10 vm, and using the gpu passthrough for hw transcoding?