is there any problem with telegram-FOSS. The last two updates 7.9.3 (22/08/21) and 8.0.0 (02/09/21) are available on github, but missing on f-droid.
Yes, work in progress, it takes time and human work to clean it up and make it fully open-source: https://gitlab.com/fdroid/fdroiddata/-/merge_requests/9687
are you missing some functions?
Right, last two updates. In particular, live streaming in channels, playback speed and flexible forwarding.
Just updated telegram foss to version 8.0.0 from f-droid