(Moved Post)
Here is an odd one I am chasing after.
My test router at the shop has Zerotier 1.6.5 on it as the RB3011 is running 7.1rc4
The router we put at a the bosses brother's has Zerotier 1.6.6 on it, as the RRB3011 is running 7.1
Both have Zerotier bridged to the bridge
The RB3011 with 7.1rc4 on it... I can discover things via ARP.
The RB3011 with 7.1 on it... I can't. But I can connect to devices if I manually enter the MAC address.
I have several hAP AC2s Running 7.1 and they work normally. Open winbox and they pop up in discovery. Devices on their LANs are discoverable too.
I think this might be specific to the RB3011 with 7.1 RELEASE