When inputting a 5th level Warpriest with the Molthuni Arsenal Chaplain archetype I can see that I get the appropriate Weapon Focus added from the class for level 1. I choose Musket for the Weapon Focus and then for my bonus feat I choose Advanced Weapon Training. This causes the Advanced Weapon Training tab to appear, however when I try and choose any option from the list of weapon trainings, the dropdowns to select an applicable weapon group are all empty.
Warrior Spirit for example.

I can see the Fighter Weapon Training being applied to my weapon as expected, but for purposes of the Advanced Weapon Training feat, it seems that the musket weapon is not being considered a valid option.

Occasionally error like this fire when adding and removing the weapon training selecting under Advanced Weapon Training:

Does anyone know of a way to somehow add the weapon grouping? I have familiarity with adjusting bootstraps and things, however this seems to be more of a finicky issue that I am unsure how to bypass. Or if it is a bug how I would go about reporting it correctly?
Thanks!
Warrior Spirit for example.

I can see the Fighter Weapon Training being applied to my weapon as expected, but for purposes of the Advanced Weapon Training feat, it seems that the musket weapon is not being considered a valid option.

Occasionally error like this fire when adding and removing the weapon training selecting under Advanced Weapon Training:

Does anyone know of a way to somehow add the weapon grouping? I have familiarity with adjusting bootstraps and things, however this seems to be more of a finicky issue that I am unsure how to bypass. Or if it is a bug how I would go about reporting it correctly?
Thanks!