https://github.com/telegramdesktop/tdesktop/releases/tag/v2.5.1 Telegram (stable) 2.5.1 was released a while ago. Differences since 2.4.11 include (copied straight from the changelogs): Voice chats in groups. (alpha version) Fix voice messages sending. Fix crash in voice calls. Create voice chats in legacy groups. Fix sticker pack opening. Fix group status display. Fix group members display. Improve design of voice chats. Fix sending of voice messages as replies. Fix 'Open With' menu position in macOS. Fix freeze on secondary screen disconnect. Turn any of your group chats into a hop-on, hop-off conference call. Get up to several thousand participants in each voice chat. Control the number of speakers with flexible admin tools. Fix crash in voice calls.
*** This bug has been marked as a duplicate of bug 763522 ***
Apparently I missed it because it doesn't show up in https://packages.gentoo.org/packages/net-im/telegram-desktop/bugs Thanks.