From the research on flying/floating (under/through objects [foundations and ceiling mostly]) bug that i’ve made i have found out that it comes out from one of two factors or both of them at the same time in significant number of players’ cases: It’s the lack of player’s memory or gpu capacity (i’m not currently able to make further tests on these technical things).
But i gotta tell you that the actuall problem is players’ experience towards these problems when these are unintelligible. Those players just get to believe that your game is just very badly bugged or/and the servers are bad.
Just think about it.
There’s also a solution that i thought of in this context. It says that: The player’s pc memory should not be overloaded by objects that are currently far away from player in expense of properly loaded functions of objects being in the viscinity. And if you do follow that hint: In the best scenario players will no longer whine about floating through textures bug (ever). In the worst scenario they will ask questions on the forum and will get the proper answers saying that they need better memory. In both cases the results will be better than what we’re dealing with now.
AND If you guys are looking for an employee who could be your manual tester or UX advisor don’t hold back to gimme a ring 
i’d be glad to help 