Some more things need to verify:
During Handout case:
Check the src ENB last received ACK or NACK, that should be the least SN of the Forwarded packet(among all forward packets).
During Hand-in case:
Verify the PDCP status report from UE for which SN onwards expecting in UL from the target.
In all forwarded packets, the large SN from all SNs of the forwarded packets +1 should be present in the SN status transfer message and the same should use target ENB(verify in the UE logs).