Strange Folders/Permissions in ~/.cache

[Douglas Summers]

I'm trying to figure out what these folders are and why the permissions
are so strange.

In my ~/.cache, I have a folder called 'doc'. 'ls -l' shows me this:
d?????????  ? ?        ?           ?            ? doc

Diggin further, I found these Flatpak folders underneath it:
doc:
total 0
drwx------ 2 root root 0 Dec 31  1969 b21f992a
dr-x------ 2 root root 0 Dec 31  1969 by-app
drwx------ 2 root root 0 Dec 31  1969 f83e274f

doc/b21f992a:
total 0

doc/by-app:
total 0
dr-x------ 2 root root 0 Dec 31  1969 org.gnome.Evolution
dr-x------ 2 root root 0 Dec 31  1969 org.kde.okular

doc/by-app/org.gnome.Evolution:
total 0
drwx------ 2 root root 0 Dec 31  1969 f83e274f

doc/by-app/org.gnome.Evolution/f83e274f:
total 0

doc/by-app/org.kde.okular:
total 0
drwx------ 2 root root 0 Dec 31  1969 b21f992a

doc/by-app/org.kde.okular/b21f992a:
total 0

doc/f83e274f:
total 0

Okular was installed as a test a while ago, but has since been removed.
I guess my questions are (a) do I need these folders, and (b) how did
the permissions get so borked?