I just double checked and made sure I wasn't focused on CPU 1. When I hit either F10 or F11 to go to the next instruction, it stays on CPU1.
The only reference to 4FE2 I can find is here:
8DB1: LDX #$4FE2
8DB4: STX $FFDE
EDIT: It's triggering an interrupt, I think. According to this site
, FFDE-FFDF is IRQ15 (low priority PICU). $5025 is an RTI opcode and jumps back to $4FE2.