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There is a nasty but easily reproducible rendering bug on Narvik: breaking a specific section of certain walls appears not to remove the occlusion-thingy, leaving a hole which you cannot see through as the geometry behind it continues to be occluded.
The culling also appears to be "one-way" making it exploitable in theory; players from the outside can see players on the inside, but players from the inside cannot see players on the outside (I tested using sniper decoys, not sure if this translates to actual players).
Here is a video showing how to reproduce this issue: https://youtu.be/sVr5glZ2ZJg
At the end of the video I also show a separated collision issue present on the same map.
Hopefully it's an easy fix and something the team will be able to sneak in the Community Games update.