I'm a little worried about its performance.
Here's some images from today's encounter in Fields of the Dead.
At the NE ruined crypt on surface, the 2 skels and 1 vamp spawn encounter.
1st Turn attempt.

2nd Turn attempt: At this point, only the Vampire remained.(Note Vampire's rebuked status had finished by now).

In this second image, not only did the Vampire not get destroyed, nor rebuked, it didn't even appear to undergo a Turn roll...
I'm concerned either Turn Undead ability is not performing to it's max ability?
Or.
The spawns are somehow unrealistically resistant/immune/notgetting checked properly to Turn Undead.
Can someone with better understanding of the mechanics and dice rolls of all this check on this? Was this an outlier? Did this perform to plan? Is there any bugs possibly with the process?
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Update: Mummies appear to be turning fine inside the Crypt.
Zombies turn and fall easily.
Vampires seem to be ALOT harder to destroy/turn outright. Haven't been able to destroy one yet on a turn.
Encountered 3 summoned vampire companions during the run through the easier of the two Fields crypts. The ones spawned from shadow priests. Turns would roll a check, and rebuke successfully. But not destroy.
All checks were done with similar dice rolls to what is shown above, sometimes the HD max was up to 82.
Updated summary: Much happier knowing that all skells, mummies and zombies get destroyed outright in the initial Turn.
Bit worried about the lesser vampires not. And the failed dice roll to even check against the Vampire. Yes, rebuke had expired on it, i stood around long enough. Curious as to what makes these so special, in comparison to other undead.
Also want to reiterate the bug that with a Summoned Vamp by an enemy, if you Turn, and it successfully rebukes. If you proceed to go and attack its master, it will move to you and attack. The minute you stop attacking its companion, it stops attacking you.