Bubble on newly placed zirconia crown

[apm]

I got a zirconia crown placed on an upper molar and it has some sort of a bubble where I'd expect just a tooth groove.

The dentist that put the crown told me he could shave it if it bothers me but I'm not sure how it could bother me besides looking visually weird and possibly meaning there is some issue with the crown. He didn't seem concerned but I'm a bit worried whether it is possible that this bubble means that the crown was poorly made or has some sort of a defect?

(The crown was prepared by a lab after a scan by the dentist).

 

[Dr M]

No, this is not a weak spot on the crown. This was just the design preference of the technician. If it does not bother you, other than visually, I would recommend leaving it. No one other than you will see it, and shaving down a crown unnecessarily, might compromise the integrity of the crown.