Minecarts having issues turning at corners. (19w09a)

19w09a seems to be having issues with minecarts and how they behave when interacting with "corner rails".

I have included a link to a video (FIle Size always exceeds the 10MB limit) which demonstrates the issue(s).

( https://www.youtube.com/watch?v=ouS6VcHPiXw )

Apologies in advance is commentary is preferred to not be included.