The summary is that i placed down two powered rails with a one block gap between them. Then i dug a one block hole in the gap and place a powered rail there.
the powered rail or normal rail placed there will always connect to only one of the other two powered rails.

*What actually happened was that the powered rail or normal rail placed in the hole in between will always connect to only one of the other two powered rails depending on the orientation so for example - i place down the two rails with one block gap between them -the one is facing to the east and one to the west i dig the hole in the middle and place the other rail - the LAST rail placed will ALWAYS connect to the one facing west.

Steps to Reproduce:
1. place two rails or powered rails with a one block gap between them
2. on the gap dig a one block hole
3. put another rail in the hole - it will always connect to one of the rails mentioned in step 1 NEVER the other no matter what you try to do to connect it to the other.

This is a repost of the following link
https://bugs.mojang.com/browse/MC-51735

It is not resolved because the rail in the middle will SWITCH to the one facing west or wherever the default side is, For example i make the slope the way i want it but when i place the "default side rail" back the rail on the hole will switch back to it WHATEVER i try to do to block it
sorry for the repost of this issue but since you have the other link as resolved i believe noone has seen my comments on in