If I am not mistaken, it seems that telegram-desktop requires some Qt libs with version 6.8, whereas in the updates repo version 6.9 is available. Hence the downgrade. To showcase this, the below command was run with fedora repo disabled:
$ dnf install telegram-desktop --disable-repo=fedora --assumeno
Updating and loading repositories:
Repositories loaded.
Failed to resolve the transaction:
Problem: conflicting requests
- nothing provides libxcb-keysyms.so.1()(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libjemalloc.so.2()(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides librnnoise.so.0()(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libprotobuf-lite.so.30()(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libqrcodegencpp.so.1()(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libdispatch.so()(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libQt6Core.so.6(Qt_6.8_PRIVATE_API)(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libQt6Gui.so.6(Qt_6.8_PRIVATE_API)(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libQt6Widgets.so.6(Qt_6.8_PRIVATE_API)(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
- nothing provides libada.so.2()(64bit) needed by telegram-desktop-5.13.1-1.fc42.x86_64 from rpmfusion-free
You can try to add to command line:
--skip-broken to skip uninstallable packages
You could report it, or give it some time, as your post will probably be noticed by the RPM-Fusion package maintainers.