If your near a wall , you can see trough just placing the camera near and strafe with Q or E on 3rdperson.
If your first person , just zoom and run forward the wall.
This is a serius game breaker issue.
I attach some SS examples. {F29150} {F29151} {F29152} {F29153} {F29154} {F29155} {F29156} {F29157} {F29158}