--keep-active not keeping my watch active

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Environment

• OS: CachyOS
• Scrcpy version: 4.0
• Installation method: pacman
• Device model: Galaxy Watch 8 Classic
• Android version: 16

Describe the bug

--keep-active not keeping active. It launches, and it streams my watch, but if I put my hand down too long, my watch sleeps and disconnect.

scrcpy --tcpip=$IP:5555 --no-audio --keep-active

scrcpy 4.0 <https://github.com/Genymobile/scrcpy>
INFO: Connecting to $IP:5555...
INFO: Connected to $IP:5555
/usr/share/scrcpy/scrcpy-server: 1 file pushed, 0 skipped. 584.1 MB/s (732226 bytes in 0.001s)
[server] INFO: Device: [samsung] samsung SM-L505U (Android 16)
INFO: Renderer: opengl
INFO: OpenGL version: 4.6.0 NVIDIA 580.159.03
INFO: Trilinear filtering enabled
INFO: Texture: 438x438
WARN: Device disconnected

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Start by reproducing the reported command with scrcpy 4.0 on the Galaxy Watch 8 Classic running Android 16, focusing on the --keep-active entry point and the device-disconnect output. Compare behavior while the watch is idle and when the user's hand is down; done means the watch stays awake and the scrcpy connection remains active.