If you have a basic group chat that already has Pinned Messages, then you upgrade the basic group chat to a supergroup, it won't be possible to unpin them.
Workaround
Deleting the old messages from the chat history will unpin them.
Steps to reproduce
Note: You can change History setting to Visibile instead of Hidden, or something else, to force a supergroup upgrade.
Create a New Group
Send some individual messages to the basic group chat
Pin all messages in the group
Upgrade the group to a supergroup
Current result
When you right click on a previously pinned message the Unpin button is missing.
If you tap on the X in the pinned list header, nothing happens.
Expected result
When you right click on a previously pinned message, the Unpin button is shown.
If you tap on the X in the pinned list header, the popup to unpin the message appears.
Device info
Telegram Desktop v2.7 // Windows 10 and macOS 11.2.3
I had same problem. I cleared all pinned messages and now it's better
D
Diogo Carvalho
Same issue here. It updates correctly on Android, but not in the Windows version. Currently using Telegram Desktop v2.5.7, but the upgrade to supergroup was done in an earlier version. "Unpin all" only applies to messages created after the group upgrade. Finally, pinning one message created after the upgrade of the group doesn't update the icon, i.e. I still see a cross even with several pinned messages (as long as there is only one pinned message created after the group change).
riccardo
Is it ever going to be fixed? On iOS/Android it's not a big deal, but from desktop it's impossible to dismiss them and they are going to stay there forever
Vlad
The problem is still relevant, infected in Telegram (Android), version 9.6.4. The video shows.
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"Unpin all" only applies to messages created after the group upgrade.
Finally, pinning one message created after the upgrade of the group doesn't update the icon, i.e. I still see a cross even with several pinned messages (as long as there is only one pinned message created after the group change).