I think all the eigrp neighbors of the router may be connected in vlan 3 of the switch ... and the switch also is a part of the eigrp AS.
Show ip eigrp neighbors will always list down the layer 3 interface... so the router reaches to the other eigrp neighbors in the same broadcast domain via the switch connected on fas 0/0 and at the same time also forms eigrp neighborship with the switch.
Perhaps it will help if we remember that EIGRP neighbor formation uses multicast packets (126.96.36.199). The router is physically connected to the L3 switch but the connection is part of VLAN 3 and VLAN 3 forwards multicast packets from 10.220.96.2 and 10.220.96.3 through the layer 3 switch to the router. This is how the EIGRP neighborship is formed through the VLAN.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...