For example, I have a folder C:\tmp with subfolder C:\tmp\1 (lets say it's size is 1 MB) and it's junction as C:\tmp\2. When I try to calculate size of folder C:\tmp, TC says 2 MB while Windows Explorer says 1 MB. Mismatch.
Go on, make a junction to C:\tmp\1 as C:\tmp\1\1 (i.e. folder link inside this folder). Windows says folder size is 1 MB... But TC says... about 40-50 MB!!! (I think, later calculation is impossible because of long path)
So I think TC shouldn't calculate size of a junction (as Windows Explorer).
I.e. if a folder has inside only junctions to other folders, Windows says it has size 0 B. But in folder tree Windows tries to open infinity loop of junctions...

Copying such symbolic link also buggy - TC copies it with all of it's infinity subfolders. (but it is my buggy fault

BTW, it isn't hard to check if a junction points to upfolder and make its analog. (but is it really what we need?)