Snap icons are not restored after update of snap :)

A very minor issue. I use Ubuntu 16.04 ESM for banking, so I use the newest snaps of Firefox and LibreOffice :)
After an update of the snap the icon disappears and I have to move it there again manually. I noticed that In Ubuntu Unity 22.04 that issue has been solved, so maybe you can have a look at that solution.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox (not installed)
ProcVersionSignature: Ubuntu 4.15.0-216.227~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-216-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.30+esm3
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 16 11:14:03 2023
InstallationDate: Installed on 2017-03-29 (2362 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)