It seems to be more a cosmetic problem. I really can’t say if they weaken the joint. If the bubbles aren’t dealt with though, they’ll always be visible. Not an issue if that’s the interior side. Or if you plan to paint the camper. If you’re not using the suggested epoxy spreaders, purchase some before continuing. They’ll go a long way in removing bubbles and later in removing excess fillets.
Your skill in applying epoxy and fiberglass cloth will increase exponentially as your build progresses. This feller has all sorts of how-to epoxy fiberglass onto boat hulls: https://www.youtube.com/watch?v=nTmGLqhgnoM
Same principles for our builds. Many more like videos on youtube. Others show how to create fillets and smooth fiberglass cloth. They were very helpful to me.