upon reaching level 5 I am given the prompt to choose a mutation before rapidly advancing--
i do so, picking the mutation that is intended to grow a new limb
i am then never given a prompt to pick any limb, and do not receive a random one either
i also find that while i gained a mutation, it did not spend my 4 MP

i have also at least once not even been given the option for a rapid advancement upon reaching level 5 and believe this may have something to do with unstable genome

my mod list
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Joppa Chests Aren't Stealing
Choose Your Body
AlwaysAwardXP
Appearance Change Wish
Careful What You Wish For
Hearthpyre
Hexagun
Limbsmith (installed afterwards to attempt to fix this issue, not the cause)
You see a cave spider and that's okay