Everything to do with 2 and technically 3 is known. - it also all applies to every single physic-connected item
A note from bedroom
a cheese wedge
a dagger
a stone
crate
ingots
swords
anything can do it.
The only thing I can mention other than that, is to attempt to "crouch" jump when trying to maneuver in and out of uncomfortable places. - you can crouch an insane amount and some spaces are accessible by timing crouch right - like hopping over your fence at almost any location, or any fence, as well as through windows with no glass on them.
You could also maybe try slipcor's character model reset - I don't know everything it does, but I think it fixes character position, rotation and sets you back in bedroom (Puts you at ground level, fixes orientation, and places you in bedroom, to say that slightly differently and maybe more understandable )