Hey,
Oh sorry, I should have mention that.
I am using as per documentation: https://pve.proxmox.com/pve-docs/api-viewer/#/nodes/{node}/qemu/{vmid}/vncproxy
However, the code also appends ?websocket=1, using this since Proxmox 5.x.
Removing websocket=1, despite not using websockets at all, just...