How to reproduce: When you train a monk, there is no way to roll dexterity in mystic on a bow, which is needed by scoundrel and should be possible because dex is std stat for monk.
There’s something strange going on here.
I crafted a bow without dexterity:
https://imgur.com/k6eCNHe
Then went to mystic and enchanted vitality to dexterity:
https://imgur.com/YWYmWwc
Wanted to make another enchant, for maybe better roll, but trying to enchant for more dexterity gives no dexterity option at all:
https://imgur.com/Hg1HBf8
Just to test it, I enchanted to attack speed, no more dexterity offered:
https://imgur.com/eKVSBA8
I crafted another bow without dexterity, and placed it in the cube:
https://imgur.com/7YZ2wTW
It gave me a bow with dexterity:
https://imgur.com/lU56J9e
Trying to enchant for more dexterity gives no option for dexterity at all (as with the other bow):
https://imgur.com/aul45B0
No issues here. Monk crafted a bow with no dex.
First enchant gives option for dex: https://i.imgur.com/x8NqJBU.jpg
Next enchant also gives dex: https://i.imgur.com/teUwKQL.jpg