Telegram tray icon is suddenly a blurry pixmap, not a sharp svg

Support KDE Plasma
2

This is a known issue based on changes within SVG files. Clearing the Plasma SVG cache fixes it. Do this: rm ~/.cache/*plasma* ; killall plasmashell && kstart5 plasmashell

If did not help, try strengthened variant of clearing cache (to be sure that it is not the cache-related issue)

  1. Log out from user session to shutdown all KDE and user apps which could use the cache.
  2. Enter TTY, for example TTY3: Ctrl+Alt+F3.
  3. Login in that textual terminal.
  4. Clear all cache and extra KDE-related stuff by entering these 3 commands: KDE - ArchWiki .
  5. Type systemctl reboot to reboot PC.

https://wiki.archlinux.org/title/KDE#Clean_cache_to_resolve_upgrade_problems