Based on the log in comment 12, you'll also need

/run/mount/utab r,  # I'd guess rw, but you can try r only and check the log 
again
/run/mount/utab.act w,
/run/mount/utab.event w,

Also, according to this log, fusermount3 (actually umount, see comm=)
runs as root, so granting   capability setuid,   might make sense to
allow it to switch to a less-privileged user.

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Title:
  error: Failed to install org.gnome.Platform: Could not unmount
  revokefs-fuse filesystem at /var/tmp/flatpak-
  cache-4EB3B3/org.gnome.Platform-EM6KC3: Child process exited with code
  1

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