Mystical Teachings showing to select only one spell instead of 2 differents

Keyler

This issue was fixed but is happening again since one week ago, maybe more.

Lot of times Mystical Teachings spell shows you only one spell to choose instead of 2 differents.

Janosik

I've been getting this issue a fair bit in the last month, maybe, a few times a week?
Before that I'd never encountered this problem before casting Mystical Teachings (and I cast Mystical Teachings a lot!)

I wonder if it's related to this issue:
https://forums.d3go.com/discussion/91420/fetch-failure