[U 22.04] custom app-starter cannot be changed

steps to reproduce:

1) create a new starter by alt+rightclick on gnome panel and selecting "add to panel" from menu and "custom app starter"
2) fill out form (name, command, ...), all is saved after clicking "ready" button up right
3) now do rightclick on the new starter-button in panel and choose "properties" => you'll see same dialog like before, but instead of the "ready" button up right now 2 buttons below the form "reset" and "close". You can change anything (name, icon, command,..) and use close-button (we do not want to reset). But your settings are not stored (no changed behaviour/icon and if entering properties again still setting from the first creation are shown)

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-panel 1:3.44.0-1ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-30.31-generic 5.15.30
Uname: Linux 5.15.0-30-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: GNOME-Flashback:GNOME
Date: Thu May 26 15:07:18 2022
GsettingsChanges:
 b'org.gnome.gnome-panel.layout' b'object-id-list' b"['menu-bar', 'indicators', 'show-desktop', 'window-list', 'workspace-switcher', 'launcher', 'launcher-0', 'launcher-1', 'launcher-2', 'launcher-3', 'launcher-4', 'launcher-5', 'multiload', 'custom-launcher', 'custom-launcher-0', 'custom-launcher-1']"
 b'org.gnome.gnome-panel.layout' b'toplevel-id-list' b"['top-panel', 'bottom-panel']"
InstallationDate: Installed on 2022-05-22 (4 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: gnome-panel
UpgradeStatus: No upgrade log present (probably fresh install)