I believe I’ve found a minor bug in Telegram(I hope this is the right place to post it here, if not I kindly ask you to move it to the right place or tell me where I should post it):
The package Telegram-desktop with gnome(dark-mode) on Testing: Version: 2.5.6.r8.gefde011f1-1
The Icon on the top right bar is just a white square and every right click affiliated with telegram opens the correct window, but it has a ugly white boarder.
Solution: downgrade if it is a problem.