FreeCAD source code is on Microsoft GitHub, installing anything from there is a major security threat and the developers officially do not care. The whole thing is to avoid.
Some bugs (examples: mark not possible,right mouse menu shows only "navigation bar",crashes,...) in LM20.1; I advise the "non-Flatpak" version!
Ab und zu ein Absturz alle 10min sichern dann ist man auf der sicheren Seite. (hier die Sysinfo:https://termbin.com/6q08)