I've found 2 other issues:
- If you have a thread with replies by yourself and are subscribed to this thread, the subscription will stay if you move the thread to the project tools.
Viewing all your subscriptions show a locked icon for the thread.
- Similar situation as above: You've subscribed to a thread and there are new messages you didn't yet read. The thread got moved to the project tools.
Now everytime you go to you UserCP, there is the notification about unread threads. Same goes for New Posts.
I think the subscription should be removed while moving the thread to the tools, because it is no longer a thread but a issue.