Over time if the bedder did not do a good job, the paper will release and it will also release if you have some shifting.
I would remove the paper tape and clean the area and instead of paper tape use the new nylon mesh tape. There is three steps in the taping process, you have a 24 hour drying time between each step (if you use reg. joint compound).
Apply some mud over the area and run your tape over it. Let it dry. Apply more mud over the area again and let it dry. Each time feathering over the area lightly. Let it dry. Apply another layer of mud and after drying sand it lightly to make it smooth and even with the other ceiling and walls. After drying, lightly texture the area. After drying, prime it and then paint it.
You may not have received enough mud over the tape on the first time and the paper released. This way, the mud is over the tape three times and she should work for you. The nylon tape will do some movement ever so slight.