Games fail to launch if umu-launcher is enabled

Trying to launch any game with umu-launcher enabled in advanced settings. Attached is an example log of trying to launch a game, with the problematic line being steam-runtime-launch-client[428]: E: Unable to convert /app fd 16 into path: different file inside and outside sandbox. Having the same issue on two different PCs, both running Arch. I've uninstalled the system umu-launcher just to make sure that wasn't interfering but got the same result.
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