Using vulkan in any flatpak only sees my integrated graphics (9070 XT)
Checked this using Dolphin's Graphics Options and a bespoke app for exposing what flatpaks can see (https://github.com/arunsivaramanneo/GPU-Viewer). I also gave Flatseal permissions for GPU accel explicitly.
Doing some looking around it seems like people who have this issue mention there's seperate drivers for flatpaks, and when looking at the GPU Viewer it does read Mesa 24 drivers instead of 25.
When i run vulkaninfo --summary in Terminal it does show properly: