While trying to add more than 11 channel modules into our blueprint and the new channel button disappears therefore not being able to add more than 11. In the documentation, the limit is 15.
Release : 16.1.3
The limit for active channel modules per blueprint is 15. If there is already 15 channel modules for the concerned Blueprint then the "new channel" button will be hidden.
There is channel modules that are not present in the object tiles.
Edit the Blueprint, bring the previously created channel modules back and delete the ones that are not required and keep the limit under 15.
New Channel button is back