Thanks for your response. Specifically the unread count next to the folder name under 'Favourites.' The tab title count does update. I've tested in both Firefox 111.0 and Edge 111.0.1661.41 (Windows 10). Ingocnito mode doesn't appear to make a difference. Installed from grommunio.x86_64-2022.12.1-Build23.16.install.iso.
# zypper se -s grom | egrep ^i | awk -F '|' '{print $2,$4}'
grommunio 1-lp154.8.2
grommunio-admin-api 1.9.35.e075ce0-lp154.52.1
grommunio-admin-common 6.cb985db-lp154.3.1
grommunio-admin-web 2.6.0.54.c3a5ade-lp154.37.1
grommunio-antispam 3.4-lp154.4.1
grommunio-common 13.02127be-lp154.17.1
grommunio-cui 1.0.248.5feaa6f-lp154.49.1
grommunio-dav 1.2.0.9976bca-lp154.3.1
grommunio-dbconf 1.1.1.da20a46-lp154.4.4
grommunio-error-pages 1.0.6.9c50afb-lp154.3.2
grommunio-imapsync 2.178-lp154.1.2
grommunio-index 0.1.34.aef1495-lp154.37.1
grommunio-release 2022.12.1-lp154.3.2
grommunio-setup 1.0.84.d707674-lp154.17.1
grommunio-sync 1.2.2-lp154.101.1
grommunio-web 3.2.21.8a4583e-lp154.197.1
gromox 2.6.0.6ef606f-lp154.1.1
gromox-debuginfo 2.6.0.6ef606f-lp154.1.1
gromox-debugsource 2.6.0.6ef606f-lp154.1.1
grub2-theme-grommunio 1-lp154.11.2
NAME="grommunio" "2022.12.1"
patterns-grommunio 1-lp154.8.2
plymouth-theme-grommunio 1-lp154.11.2
system-user-grommunio 3-lp154.10.2
system-user-gromox 2-lp154.13.2
systemd-presets-branding-grommunio 2022.12-lp154.1.2