2 clients and RB750Gr3 router configured to the same subnet (10.140.1.0/24), all default config (i.e only gateway IP and DHCP range configured, default config adds all 1-4 ports to bridge)
Both clients can ping the gateway (10.140.1.1)
LTE1 (3G modem) works for both
Neither client can ping eachother
Neither client can be pinged from router using Tools -> Ping
Both clients can be pinged from router using Tools -> Ping (ARP Ping)
Issue is present whether both clients are connected directly to router network ports or connected to an unmanaged switch and switch is connected to the router
I have already tried updating RouterOS to 7.6 and 7.7beta but the issue persists, upgraded firmware to 7.7beta8. What else could i check?