[BUG] (data) Cannot get slotted ioun stone effects for some wayfinders

[xenusuk1]

Describe the bug
given you have a wayfinder and an ioun stone
when you add the ioun stone to the wayfinder slot
then pcgen should also allow you to add the ioun stone ability (in tab feats & abilities / equipment)
so that the effect is applied to the character

To Reproduce
The process works correctly if you use a wayfinder from the "seekers of secrets" source
but does not work for wayfinders from "adventurers guide" source
missing data seems to be: BONUS:VAR|WayfinderStoneSlots|1|TYPE=Base

Expected behavior
All wayfinders should provide the ioun stone ability

Screenshots
n/a

Desktop (please complete the following information):
pcgen 6.09.05

Character File
n/a

Additional context
Add any other context about the problem here.