Today, after upgrade my Fedora 35 system I get this error:

telegram-desktop: error while loading shared libraries: libQt6Core5Compat.so.6: cannot open shared object file: No such file or directory

Solution:

sudo yum -y install qt6-qt5compat-devel qt6-qtsvg-devel qt6-qtwayland-devel

Hope this help.

-- 
Dario Lesca
(inviato dal mio Linux Fedora 35 Workstation)