Loading the OpenFOAM bashrc by default makes the Ubuntu 20.10 desktop unale to load (X11-only)

I stumbled upon a very weird issue that I can consistently reproduce on the same system. After installing OpenFOAM v2006 on Ubuntu 20.10 (see #1902 (closed)) and adding source "/usr/lib/openfoam/openfoam2006/etc/bashrc" to my ~/.bashrc, my desktop fails to launch in X11, while it loads normally on Wayland.

There is no error, the system simply returns to the login screen after a few seconds. Removing this line from my ~/.bashrc or making it an alias (so that I load it on demand) fixes the issue.

Any clue why this could happening? Can you reproduce it?