It’s not a bug, it’s a feature!
So we used to have an end world that was connected to our main world, which is the city. However, the issue was, that despite the fact taht your inventory would be cleared, people could drop weapons etc from a creative world city through the portal into the end and then fight the dragon.
So I had to create an end world which is not connected through a standard End portal to the city. Instead it’s the same portal tech as used in the spawn house to get to the other worlds.
The result of this however is that you cannot get out of the end throug the standard portal either. In order for you to get your stuff out, I allowed people to deposit things in the end.
So next time you kill the dragon or want to get your stuff out of the end, simply deposit it and kill yourself.