Wiping .cache makes gufw fail, cuts network access ?

I added a line to /etc/fstab to put my ~/.cache on a tmpfs:

tmpfs /home/user1/.cache tmpfs nodev,nosuid,mode=1777,size=1G,defaults 0 0

or:

tmpfs /home/user1/.cache tmpfs noatime,nodiratime,nodev,nosuid,mode=1777,size=1G,defaults 0 0

[I tried a couple of versions, and rebooted a number of times, not sure of the exact configuration, sorry.]

After reboot, the system had no network access. "ping 1.1.1.1" or similar failed. I am using wired Ethernet. Tried various fixes. I eventually fixed the problem by uninstalling gufw. I'm not 100% positive gufw was the problem. But now (with first form of fstab line) everything works.

Is gufw storing something in ~/.cache that it shouldn't be ? I should be able to wipe ~/.cache and reboot and have everything work, correct ? I had no rules set in gufw, just enabled and Incoming=Deny. System worked okay with gufw before I added that fstab line and rebooted.

I'm on Kubuntu 20.10, kernel 5.8.0-41-generic, gufw 20.10.0-0ubuntu1

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: gufw (not installed)
ProcVersionSignature: Ubuntu 5.8.0-41.46-generic 5.8.18
Uname: Linux 5.8.0-41-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Thu Feb 4 14:07:32 2021
InstallationDate: Installed on 2021-02-03 (1 days ago)
InstallationMedia: Kubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
SourcePackage: gui-ufw
UpgradeStatus: No upgrade log present (probably fresh install)