Placing rails on barrier blocks then going beneath the barrier blocks causes the rails to flip.
How to replicate:
1. Place some barrier blocks so that they curve.
2. Place regular rails on top.
3. Go beneath the barrier blocks
Linked issues
is duplicated by 6
MC-51691
Corner rails render backwards from below
Resolved
MC-51920
Bent rails don't render correctly from beneath -NinDr3w
Resolved
MC-52046
Curved rails are rendered wrong from bottom
Resolved
MC-52538
Weird rail track issue
Resolved
MC-53027
Rails render in the wrong direction
Resolved
1 more links
Confirmed for 14w11b. Added another screenshot.