Hey, this bug where the X button doesn’t dismiss the “Conversation Corrupted” banner was fixed in a newer version.
You’re on 2.3.21 from January 2, which is pretty old. Since you said you downgraded, that’s likely why you’re seeing this. Updating to the latest version should fix the X button not working.
About the corrupted conversation, that’s expected if you open chats created in a newer version using an older one. The data format might not be backward compatible. You’ll need to start a new chat for that conversation.