I think this should be fixed in Gnome Shell 3.35 as the offending icons are no longer used.
** Tags added: fixed-in-3.35 fixed-upstream -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1724098 Title: Panel menu icons are briefly way too big (when opened the first time) Status in GNOME Shell: Confirmed Status in gnome-shell package in Ubuntu: Triaged Bug description: On every fresh boot, the first time when you click the drop down menu for SOUND/WIRELESS/SHUT-DOWN, the sound icon jumps out very big in size...BUT ONLY THE FIRST TIME WHEN YOU RESTART the machine!! --- ApportVersion: 2.20.7-0ubuntu3 Architecture: amd64 CurrentDesktop: ubuntu:GNOME DisplayManager: gdm3 DistroRelease: Ubuntu 17.10 GsettingsChanges: org.gnome.shell enabled-extensions ['ubuntu-appindicat...@ubuntu.com'] org.gnome.shell app-picker-view uint32 1 org.gnome.shell favorite-apps ['chromium-browser.desktop', 'firefox.desktop', 'org.gnome.Nautilus.desktop', 'rhythmbox.desktop', 'org.gnome.Software.desktop', 'yelp.desktop', 'ubuntu-amazon-default.desktop'] org.gnome.desktop.interface enable-animations false org.gnome.desktop.interface gtk-im-module 'gtk-im-context-simple' InstallationDate: Installed on 2017-08-31 (46 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170820) Package: gnome-shell 3.26.1-0ubuntu3 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4 Tags: artful Uname: Linux 4.13.0-16-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1724098/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp