I did not receive the mythic cards reward on level 12 of the mastery pass of the Omenpaths, though I did receive it at level 9.
I had the same issue with the last mastery pass on levels 12 and 34. At theses levels there is also a pack reward for the set mastery and I suspect this somehow cancels the mastery pass reward, because on levels where there is only a mastery pass reward I did receive the mythic cards.
Edit:
I just reached level 20 on the mastery pass and did not receive the mythic cards even though there is no set mastery reward, so my previous assumption was wrong.
Jax#29355
I did not receive the mythic cards reward on level 12 of the mastery pass of the Omenpaths, though I did receive it at level 9.
I had the same issue with the last mastery pass on levels 12 and 34. At theses levels there is also a pack reward for the set mastery and I suspect this somehow cancels the mastery pass reward, because on levels where there is only a mastery pass reward I did receive the mythic cards.
Edit:
I just reached level 20 on the mastery pass and did not receive the mythic cards even though there is no set mastery reward, so my previous assumption was wrong.
Is anything being done about this?