You can find the prerequisites for share sheet to correctly work here: Can't see chat suggestions in the iOS Share Sheet?
Create a New Group
Send some individual messages to the basic group chat
Upgrade the group to supergroup
For example by changing the 'Chat history for new users' to visible.
From any app, use the share button to open the share sheet
In the share sheet the basic group is shown, when you share something there, nothing is sent.
In the share sheet the new supergroup is shown, when you share something, it's correctly sent.
Any iOS Device
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