Tray icon not updating to custom icon when there's new mail

[FunkySalamander]

Debian 12

KDE Plasma

Birdtray version 1.9.0 compiled at Sep 18 2022 20:58:19 using Qt 5.15.4.

Thunderbird version 102.14.0

Birdtray from Debian repo

I set a custom icon for when there's new mail & it doesn't update to it when there's unread

The tray icon is expected to change to the desired icon

Set a custom icon for normal
Set a custom icon for when there's unread
Check the appropriate boxes
Get mail
See the icon not change like it should

[rjc3rd]

Same, one year later.

Debian 12.6.0
Thunderbird 115.13.0
Birdtray 1.9.0

All installed via apt package manager.
No notifications.
No icon change or unread email count.

All other features seem to work perfectly. Such as open Thunderbird on startup plus auto hide on open or close, etc.