Some Workarounds while this issue is fixed are :
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moving the game from HDD to SSD ( greatly reduces the occurence of the bug )
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Wait 1 to 2 minutes ( the Bigger the base you are loading in , the more you would have to wait ) standing still while everything loads around you . ( normally the loading screen is there for this purpose , not showing you that the game is loading all the assests of your base ect … but I noticed that it sometimes take shorter ( or longer ) time to show you the game ( and the faster it gets the more you’ll see things like your character inside a fundation 3 stairs undertneath where it should be , and teleporting back after a few seconds of loading where you disconected , you know those times where you log in and hear your character fall and break his legs !? ) If you just wait standing still , that all your decorations , the outside weather ( if it is sunset or sunrise ect … ) there is a small adjustment period where you see clear sunlight ( where a minutes or 2 later you see the actual server (night or day ) time ) then you’ll never Float on your building pieces anymore . ( I have the game on an SSD and always wait ~ 2 minutes , and since i do this i have 0 occurence of the bug anymore )
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going out of render distance also fix the issue 100% of the time ( you just need to get out , and far enough that you actually see your building disapear , then come back in ( the better if you have a really huge castle would be to not run at full speed towards it while going back , but the floating bug shouldn’t occur anyways even at full speed )
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people state that relogging works for them ( but for me it just comes down to moving or not too quickly as the game loads )
Anyways untill a proper fix , I hope those workarounds will help you understand the bug and avoid it the most you can 