The customer has a part with a slot feature from which they have created a pattern.
When they create a drawing from the part and apply 'Automatic Centerlines', these are not applied to the pattern - only to the slot feature.
Effectively, there is only a single profile and slot ID for the slot feature itself. Currently, the software only supports a unique slot ID and its respective slot profile for subsequently creating a centerline/center mark. This is why the centerlines are only applied to the original slot.