Green zoom slider jumps

Describe the Bug
When moving around in a building holding shift and hitting the W, A, S and D keys - the green slider kept jumping up and down.

To Reproduce
There should be a two story building with a roof. Part of the second story should have holes in it, so that a person standing on some parts of the ground floor would be directly under the second story, and when standing under some parts of the ground floor would be directly underneath the cieling (see screenshot).

Put a character on the ground floor and move the green slider so that you can see the entire hround floor. If you shift-wasd-move the character to a section of the ground floor that has no part of the second floor directly above it, then the green slider will jump up and you won’t see the ground floor anymore unless you move the slider down again. The slider jumps

Screenshots/Videos/Twitch Clips

Additional Context
 

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