I purchase all the scrolls need to update masterys for Ultimate Deathknight.

I was able to select the OFFENSE masterys that I wanted.

I was able to select 6 SUPPORT masterys.

When I tried to select SWARM SMITER, I received message stating, "You cannot unlock more Masteries at this Tier".

I should be able to select this as I have selected SHIELDBEARER, have the scrolls, and only 6 masters selected.

I used my one time reset to attempt selecting SWARM SMITER again, but get the same error message.

This problem

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 seems to only be with Ultimate Deathknight, as I have selected this for other heros.