I can't provide a screenshot, but I'll try to describe again
Parent Queue
Col 0: Ticket Number (ootb field)
Col 1: Custom Form A, Field A1 (joined)
Col 2: Custom Form B, Field B1 (joined)
Example Data:
Col0 Col1 Col2
123 XXX YYY
presented on screen correctly
Sub Queue
Inherit Columns from Parent Queue
Filter on Form B, Field B1 "has a value" or any condition
Col 0: Ticket Number (same as above)
Col 1: Custom Form A, Field A1 (same as above, but system didn't create in independent Form A Join to fetch)
Col 2: Custom Form B, Field B1 (same as above, system created a Form B join properly)
Example Data:
Col0 Col1 Col2
123 ___ YYY
presented incorrect, Col1 is blank because system didn't join to Form A.
If the Filter is on a joined Form, that join is created and the field is presented.
All other non-Filtered joined Forms display as blank (no additional joins are created)