[Bug]: Sandbox freaks out with multiple GPUs

[realJoshByrnes]

Windows Sandbox version

No response

Windows build number

Microsoft Windows NT 10.0.26120.0

Other software

No response

Steps to reproduce the bug

Open Sandbox (directly from the start menu) with multiple GPUs enabled.

iGPU: Intel UFD Graphics 770 (Intel i9-14900k)
dGPU: AMD Radeon RX 6900 XT

When both are enabled in device manager, the issue occurs.
When one (either one) is enabled and the other disabled, everything works as expected.
When a .wsb file containing <Configuration><vGPU>Disable</vGPU></Configuration> is run, Sandbox works.

Expected result

Sandbox should open as it does when only one GPU is enabled (let windows decide, or apply Windows Graphics Settings)

Actual result

A window containing the following is displayed

The connection to the Windows Sandbox environment was lost.

An existing connection was forcibly closed by the remote host. (0x80072746)

Included System Information

No response

[realJoshByrnes]

I should add that this has also happens on a clean install of Windows 11 (24h2) Pro.
There's a lot of forum posts about this issue, which is where I found that disabling vGPU is a workaround (I though vGPU used to be disabled by default)