All torches in mineshafts are facing the wrong way

Note: This has been unreported for a long time and it's probably the real reason for MC-216561 as unless there happens to be a random block behind the torch it won't generate making torches rarer. Also could possibly be the reason for MC-216432

Bug Description: This is probably a recurrence of MC-124966, all torches in mineshafts are now facing the wrong way. This apart from being a bug in of itself probably makes torches rarer as those won't generate unless they happen to have a random supporting block generate. I also do not know the first version this started to occur in.

Expected Behaviour:
All torches in mineshafts generate attached to the wooden support pillars

Observed Behaviour:
All torches generate rotated 180* in the other direction

How to reproduce:
Locate any mineshaft structure (it doesn't matter whether it's above or below y0) and find any torches you will find that all of them are rotated