MPV background option not working on Media Player Flatpak 1.10.0

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Installation Details:
- Jellyfin Version: 10.9.1
- Installation Method and Platform: Docker on Linux
- Client Jellyfin Media Player 1.10.0 (Flatpak)

i use the MPV option "background=#D0D0D0" to reduce uneven wear on my oled monitor
after updating to version 1.10.0, this option no longer works, tried with mpv.conf and the client settings Manual MPV Configuration
this seems to be a Flatpak only issue, as if i install the debian bookworm version of 1.10.0 in distrobox, the background option works as expected

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my bad, background has been renamed to background-color as of MPV v0.38.0