We had that on ours. In our case, the plywood became loose and lifted, which pulled the plastic up like that. Ours was like that at 2 or 3 seams.
We happened to have the trailer at the factory getting something else fixed, and I asked them to look at it.
At first they said they would just "live with it". I told them that didn't sound right.
About a half hour later they agreed to replace the entire roof- repairing the decking, all new plastic, and everything new that went through the roof- vents, skylight, antenna, etc.
We had to make an appointment and bring it back to the factory at a later date. They did a nice job.
Ford F250 6.2 Gas, 4X4, Short Bed, Companion Hitch
2019 Jayco 28.5 RSTS, MorRyde orbital pinbox.