There is an updated pull request by UsernameRandomlyGenerated against master on the void-packages repository

https://github.com/UsernameRandomlyGenerated/void-packages flatpak
https://github.com/void-linux/void-packages/pull/27919

flatpak: update to 1.10.0
Edit: 1.10.0 is stable so I'm doing that one instead.

A patch file from https://github.com/void-linux/void-packages/pull/27919.patch is attached