I have this same bubbling on mine from the factory. I think it's normal that it happens. Everyone said to leave it alone and all will be fine but I couldn't let it go. I found that many people suggested covering the lap sealant with eternabond. So I did. I would suggest the same once you know it has cured.
"Take The Road Less Traveled"
2020 Cherokee 294BH
2021 Chevy Silverado 2500 6.6 diesel
I've been an RVer since 2007, Lifetime Camper
Gotta love the Outdoors, Disconnect and Enjoy Nature!