Hello,
I have discovered that the coodrinate showed in the F3 menu are not always correct; if you copy them and then use those to do the /tp command; you get teleported in the wrong place.
The joint video shows you the bug in action!
In case you need to know this the destination is on glass, it is the custom a set world spawn (I have changed it with the /setworldspawn) and it is in an empty world (everything is showed in video).

Please do not contact me back; this report is anonymous.