So if you have set up sneak to roll as crit damge on your sheet and your sneak attack bonus reached 10d6 on crit sneak attack bonus 10 before d6 get's treated as 0 and rolls it as such giving no bonuses. example. 31 crit 1d8+dex+prof + 1d8 crit + 10d6 sneak attack + 0d6 sneak attack crit. if you have 9d6 instead of 10d6 everything works. It is possible to go around it by writing 10d6 as 9d6+1d6, but it is still a bug.
