Geogebra flatpak not working

Hello. I just installed Pop!_OS and wanted to install GeoGebra via Flatpak. However, it seems something is broken. I have already updated Flatpak and the entire system, but this error still appears.

I managed to install GeoGebra a few months ago on Linux Mint using the same command, but now it just doesn’t work.

I think you best follow the progress of this issue: