flatpak list shows me that I only have one app and Freedesktop.org Software Development Kit (probably dependency for that app; ca 900MB) installed with flatpak and flatpak uninstall --unused returns Nothing unused to uninstall but the size of /home/username/.local/share/flatpak/repo/objects/ is much larger than I would suspect (over 1.5 GB; there are many folders with two-char names with many .files with UID names).
Can this folder be cleaned up somehow without uninstalling that app or flatpak? I'm using Debian11/KDE.