Wyrm Master Pet Did Not Gain Mutation on Kill

[SignedName]

My Wrackwyrm still had one possible mutation left, but did not receive it upon killing a Holy Champion. If I were to hazard a guess, the mutation was picked randomly but did not exclude already chosen mutations from the pool, leading to no mutation being applied.

[Kandarin]

Looks like the issue was it was trying to select a mutation barred to it by the nature of Wrackwyrms. This should be handled correctly after a recent fix.