On the top floor of the two-story camo bunker you can jump and peek through the roof if you start from a crouched position. If you jump from a standing position, your jump will be blocked by the roof as it's supposed to.
Don't know if this is new to 1.05 or not.
This is also true for every static military tent in Dayz.
If there is a crate or table in it you could jump on those and use third person to look through the walls.
EDIT: Typo.
There are several buildings I found this an issue with .. some of the mili buildings are like this if you vault on top of an item that is close enough to the ceiling .. was never and issue before because you could not get up there