Sunshine doesn't show the default monitor in the KMS list

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Running Sunshine-2025.1201.3826-1.fc43.x86_64 on Fedora 43. GPU is an AMD RX580 with two monitors, both on Display Port. The default is a Dell P2715Q at 4K (3840x2160). The other is an HP 24f at 1920x1080. The Sunshine config has the default monitor (Display ID = 0). On connecting from Moonlight (on Xbox), I get this in the log:

[2025-12-07 10:05:46.793]: Info: /dev/dri/card2 -> amdgpu
[2025-12-07 10:05:46.793]: Info: /dev/dri/card1 -> amdgpu
[2025-12-07 10:05:46.798]: Info: Found display [wayland-0]
[2025-12-07 10:05:46.798]: Info: Found display [wayland-0]
[...]
[2025-12-05 14:45:55.863]: Info: Resolution: 3840x2160
[2025-12-05 14:45:55.863]: Info: Resolution: 1920x1080
[2025-12-05 14:45:55.863]: Info: Offset: 0x0
[2025-12-05 14:45:55.863]: Info: Logical size: 2259x1271
[2025-12-05 14:45:55.863]: Info: Name: DP-3
[2025-12-05 14:45:55.863]: Info: Found monitor: Dell Inc. DELL P2715Q
[2025-12-05 14:45:55.863]: Info: Offset: 2259x0
[2025-12-05 14:45:55.863]: Info: Logical size: 1920x1080
[2025-12-05 14:45:55.863]: Info: Name: HDMI-A-1
[2025-12-05 14:45:55.863]: Info: Found monitor: HP Inc. HP 24f
[2025-12-05 14:45:55.863]: Info: -------- Start of KMS monitor list --------
[2025-12-05 14:45:55.863]: Warning: Mismatch on expected Resolution compared to actual resolution: 0x0 vs 1920x1080
[2025-12-05 14:45:55.863]: Info: Monitor 0 is HDMI-A-1: HP Inc. HP 24f
[2025-12-05 14:45:55.863]: Info: --------- End of KMS monitor list ---------

Why are both displays called wayland-0?

Even though one monitor is found, nothing is streaming so Moonlight exits immediately.

Why doesn't Sunshine show the default display in the KMS list? What does "mismatched resolution mean" and why is it looking for 0x0 (presumably a default)?