Interestingly, Dicor says roof bubbles are normal and allow for expansion...though a little contradicting as they list "not brooming" as a possible cause:
https://dicorproducts.com/faq/#air-bubbles
From Dicor's site:
"My roof has air bubbles. Is this normal?
Typically, if air bubbles occur they occur during or very soon after the roof has been applied. A couple of reasons for the air bubbles would be that they were not broomed out during application, and we ask the installer not to stretch the material during installation to allow for expansion and contraction of the membrane. Air bubbles will occur with weather conditions and humidity. Air bubbles can also occur at the seams of the roof decking due to flexing and twisting that occurs during transit. Sometimes they occur if there is a significant difference in the temperature between the inside and outside of the unit.
Back to top
Will the air bubble effect the performance of my roof?
No. The air bubbles will not blow up and pop. They will come and go with the weather conditions, humidity, etc.
Please do not puncture the air bubbles. Air bubbles mean there is room for expansion and contraction, lessening the chance of stress cracks later."