Seems that now with 1.18.4, the same issue is still very active.
I'm getting lots of false detections with ip4:xxx instead of mac-addresses over and over again.
Since you mentioned routers - I'm currently using Synology SRM Mesh network with RT6600ax, WRX560 and MR2220ac. Quite some of these entries, partially with IP6 addresses only, were detected to be "Synology" devices.
Currently I just ignore the new devices and every few days select them all and delete them.
It's just not great...
update: also sent most recent example using "send feedback" within console.
I'm getting lots of false detections with ip4:xxx instead of mac-addresses over and over again.
Since you mentioned routers - I'm currently using Synology SRM Mesh network with RT6600ax, WRX560 and MR2220ac. Quite some of these entries, partially with IP6 addresses only, were detected to be "Synology" devices.
Currently I just ignore the new devices and every few days select them all and delete them.
It's just not great...
update: also sent most recent example using "send feedback" within console.