Using Do/Undo Command makes connection impossible

Is there an existing issue for this?

• I have searched the existing issues

Is your issue described in the documentation?

• I have read the documentation

Is your issue present in the latest beta/pre-release?

This issue is present in the latest pre-release

Describe the Bug

When using the Do/Undo commands which are described in the docs, no connection is possible anymore.
Do Note: These commands work just fine outside sunshine and also worked in previous sunshine versions, though I don't exactly know when it broke.

I'm using:
sh -c "kscreen-doctor output.DP-1.mode.${SUNSHINE_CLIENT_WIDTH}x${SUNSHINE_CLIENT_HEIGHT}@${SUNSHINE_CLIENT_FPS} && kscreen-doctor output.DP-2.disable"
and Undo
kscreen-doctor output.DP-1.mode.2560x1440@144 && kscreen-doctor output.DP-2.enable

Results in

"[2025-11-29 23:04:33.089]: Error: Property tree is empty. Probably, control flow got interrupted by an unexpected C++ exception. This is a bug in Sunshine. Moonlight-qt will report Malformed XML (missing root element)."

Expected Behavior

No response

Additional Context

No response

Host Operating System

Linux

Operating System Version

Bazzite Latest (Fedora 43)

Architecture

amd64/x86_64

Sunshine commit or version

Version 2025.1127.34355

Package

Linux - Fedora Copr

GPU Type

AMD

GPU Model

9070 XT

GPU Driver/Mesa Version

25.3.0

Capture Method

None

Config

Apps

Relevant log output

[2025-11-29 23:09:07.609]: Info: // Testing for available encoders, this may generate errors. You can safely ignore those errors. //
[2025-11-29 23:09:07.609]: Info: Trying encoder [nvenc]
[2025-11-29 23:09:07.609]: Info: Screencasting with KMS
[2025-11-29 23:09:07.609]: Info: /dev/dri/card0 -> amdgpu
[2025-11-29 23:09:07.609]: Error: Couldn't find monitor [0]
[2025-11-29 23:09:07.609]: Info: /dev/dri/card0 -> amdgpu
[2025-11-29 23:09:07.610]: Error: Couldn't find monitor [0]
[2025-11-29 23:09:07.810]: Info: Screencasting with KMS
[2025-11-29 23:09:07.810]: Info: /dev/dri/card0 -> amdgpu
[2025-11-29 23:09:07.810]: Error: Couldn't find monitor [0]
[2025-11-29 23:09:07.810]: Info: /dev/dri/card0 -> amdgpu
[2025-11-29 23:09:07.811]: Error: Couldn't find monitor [0]
[2025-11-29 23:09:08.011]: Info: Encoder [nvenc] failed
[2025-11-29 23:09:08.011]: Info: Trying encoder [vaapi]
[2025-11-29 23:09:08.011]: Info: Screencasting with KMS
[2025-11-29 23:09:08.011]: Info: /dev/dri/card0 -> amdgpu
[2025-11-29 23:09:08.011]: Info: Found monitor for DRM screencasting
[2025-11-29 23:09:08.011]: Info: Found connector ID [124]
[2025-11-29 23:09:08.012]: Info: Found cursor plane [101]
[2025-11-29 23:09:08.017]: Info: Creating encoder [h264_vaapi]
[2025-11-29 23:09:08.017]: Info: Color coding: SDR (Rec. 601)
[2025-11-29 23:09:08.017]: Info: Color depth: 8-bit
[2025-11-29 23:09:08.017]: Info: Color range: JPEG
[2025-11-29 23:09:08.028]: Info: vaapi vendor: Mesa Gallium driver 25.3.0 for AMD Radeon RX 9070 XT (radeonsi, gfx1201, LLVM 21.1.6, DRM 3.64, 6.17.7-ba19.fc43.x86_64)
[2025-11-29 23:09:08.028]: Info: Streaming bitrate is 1000000
[2025-11-29 23:09:08.028]: Info: Using normal encoding mode
[2025-11-29 23:09:08.028]: Info: Using default rate control
[2025-11-29 23:09:08.046]: Info: Creating encoder [hevc_vaapi]
[2025-11-29 23:09:08.046]: Info: Color coding: SDR (Rec. 601)
[2025-11-29 23:09:08.046]: Info: Color depth: 8-bit
[2025-11-29 23:09:08.046]: Info: Color range: JPEG
[2025-11-29 23:09:08.058]: Info: vaapi vendor: Mesa Gallium driver 25.3.0 for AMD Radeon RX 9070 XT (radeonsi, gfx1201, LLVM 21.1.6, DRM 3.64, 6.17.7-ba19.fc43.x86_64)
[2025-11-29 23:09:08.058]: Info: Streaming bitrate is 1000000
[2025-11-29 23:09:08.058]: Info: Using normal encoding mode
[2025-11-29 23:09:08.058]: Info: Using default rate control
[2025-11-29 23:09:08.078]: Info: Creating encoder [av1_vaapi]
[2025-11-29 23:09:08.078]: Info: Color coding: SDR (Rec. 601)
[2025-11-29 23:09:08.078]: Info: Color depth: 8-bit
[2025-11-29 23:09:08.078]: Info: Color range: JPEG
[2025-11-29 23:09:08.089]: Info: vaapi vendor: Mesa Gallium driver 25.3.0 for AMD Radeon RX 9070 XT (radeonsi, gfx1201, LLVM 21.1.6, DRM 3.64, 6.17.7-ba19.fc43.x86_64)
[2025-11-29 23:09:08.089]: Info: Streaming bitrate is 1000000
[2025-11-29 23:09:08.089]: Info: Using normal encoding mode
[2025-11-29 23:09:08.089]: Info: Using VBR with single frame VBV size
[2025-11-29 23:09:08.089]: Warning: [av1_vaapi @ 0x7f82a84196c0] Multiple slices were requested but this codec does not support controlling slices.
[2025-11-29 23:09:08.104]: Info: Screencasting with KMS
[2025-11-29 23:09:08.104]: Info: /dev/dri/card0 -> amdgpu
[2025-11-29 23:09:08.104]: Info: Found monitor for DRM screencasting
[2025-11-29 23:09:08.104]: Info: Found connector ID [124]
[2025-11-29 23:09:08.104]: Info: Found cursor plane [101]
[2025-11-29 23:09:08.110]: Info: Creating encoder [hevc_vaapi]
[2025-11-29 23:09:08.110]: Info: Color coding: SDR (Rec. 709)
[2025-11-29 23:09:08.110]: Info: Color depth: 10-bit
[2025-11-29 23:09:08.110]: Info: Color range: JPEG
[2025-11-29 23:09:08.120]: Info: vaapi vendor: Mesa Gallium driver 25.3.0 for AMD Radeon RX 9070 XT (radeonsi, gfx1201, LLVM 21.1.6, DRM 3.64, 6.17.7-ba19.fc43.x86_64)
[2025-11-29 23:09:08.121]: Info: Streaming bitrate is 1000000
[2025-11-29 23:09:08.121]: Info: Using normal encoding mode
[2025-11-29 23:09:08.121]: Info: Using default rate control
[2025-11-29 23:09:08.141]: Info: Creating encoder [av1_vaapi]
[2025-11-29 23:09:08.141]: Info: Color coding: SDR (Rec. 709)
[2025-11-29 23:09:08.141]: Info: Color depth: 10-bit
[2025-11-29 23:09:08.141]: Info: Color range: JPEG
[2025-11-29 23:09:08.151]: Info: vaapi vendor: Mesa Gallium driver 25.3.0 for AMD Radeon RX 9070 XT (radeonsi, gfx1201, LLVM 21.1.6, DRM 3.64, 6.17.7-ba19.fc43.x86_64)
[2025-11-29 23:09:08.151]: Info: Streaming bitrate is 1000000
[2025-11-29 23:09:08.151]: Info: Using normal encoding mode
[2025-11-29 23:09:08.151]: Info: Using VBR with single frame VBV size
[2025-11-29 23:09:08.151]: Warning: [av1_vaapi @ 0x7f82a84196c0] Multiple slices were requested but this codec does not support controlling slices.
[2025-11-29 23:09:08.166]: Info: 
[2025-11-29 23:09:08.166]: Info: // Ignore any errors mentioned above, they are not relevant. //
[2025-11-29 23:09:08.166]: Info: 
[2025-11-29 23:09:08.166]: Info: Found H.264 encoder: h264_vaapi [vaapi]
[2025-11-29 23:09:08.166]: Info: Found HEVC encoder: hevc_vaapi [vaapi]
[2025-11-29 23:09:08.166]: Info: Found AV1 encoder: av1_vaapi [vaapi]
[2025-11-29 23:09:08.181]: Error: Property tree is empty. Probably, control flow got interrupted by an unexpected C++ exception. This is a bug in Sunshine. Moonlight-qt will report Malformed XML (missing root element).

Start by reproducing the failure with the documented Do and Undo commands using kscreen-doctor, then compare the resulting logs with a connection that does not run them. Trace the command-handling and connection setup entry points from the reported “Property tree is empty” error; done means both commands complete without interrupting connection setup and Moonlight connects normally.