Bug: chair on moving contraption can have you clip through it

[stann-co]

Describe the bug
a moving contraption like a rope pulley elevator, when controlled with a linked controller, can easily have you fall through the floor.
if you sit on a "seat" while doing it you are safe, But if you sit in a "chair" while doing it, you can still end up falling through the floor

To Reproduce
make simple moving contraption, going up and down, a rope pulley elevator, with a linked controller or just some levers within reach,

sit in a chair, and start and stop it moving up and down, you will eventually fall through the floor
if you do it while sitting on a seat, this doesnt happen

Expected behavior
the chair should behave the exact same as a seat

Latest.log, screenshots and crash log

[stann-co]

simple contraption setup, try this with a chair and a seat