Since 10.1.5, i no longer see tailoring patterns from previous expansions when i open my tailoring profession window. I didn’t notice this until I went to Dire Maul (north) to learn the Gordok Ogre Suit pattern (since that returned this patch, per the patch notes).
My log reported that I had learned the pattern, however when I looked, there were no patterns listed at all from previous expansions.
This also applies to my other characters (leatherworking, etc) as I can’t make Onyxia Scaled Cloaks anymore!!
The only patterns I can see from older expansions are the new Naxx ones that were re-released with 10.1.5 (frozen rune patterns, etc)
EDIT: Okay weird… I tried relogging, etc, and nothing seemed to fix it… but an hour later it’s appearing again along with other old world patterns. Very strange bug, i noticed it across several different toons… now it works again…