In classic there was no such thing as a no-fail combine, however, one shaman has noted a similar problem with the bearskin potion bag combine failing, so if the no-fail flag is in game and is intended to stay, it isn't working properly.
Meanwhile, here is your chance of success:
Success* = Skill - 0.75*Trivial + 51.5 (rounded up, for Trivial>= 68)
Success* = Skill - Trivial + 66 (for Trivial < 68)
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