To replicate:
1. Configure sysprefs:
   HoldsAutoFill to Do
   HoldsAutoFillPrintSlip to Do (optional but makes behavior very obvious)
   UseRecalls to Use
2. Edit the default circ rule to set a nonzero value for max recalls allowed and recalls per record allowed
3. Check out an item to Patron A
4. Place a hold on that title for Patron B
5. Place a recall on that title for Patron C
6. Check in Patron A's item
--> Patron B's hold autofills
--> Note that you still get a modal to confirm Patron C's recall
7. Confirm Patron C's recall
--> Note that the hold and the recall are both set to "Waiting" with the same item