As noted in github issues I succesfully created a rstudio flatpak bundle. Since I am still a R newbie, I started using "R for Data Science" as a beginners tutorial. A first quirk I found is that under Q4OS (KDE 3/qt based Debian clone) the file dialogs for Session->"Load Workspace ..." and File->"Open Project..." pop up under/below/behind the main window and thereby "freezing" the main RStudio window (if I look "behind" the main window after requesting the file dialog, I can proceed to open the corresponding file). In EndlessOS (Gnome based) the file dialogs do not show this behavior, the dialog pops up in front.
Any ideas why?