WinBox 3.20

RouterOS General
1

Probably I have found the unsupported features: Limit Broadcast, Limit Unknown Unicast and Limit Unknown Multicast in Switch > Port > ether* in WinBox 3.20 because correlated features: limit-broadcast, limit-unknown-unicast, and limit-unknown-multicast do not exist in “/interface ethernet switch port” in RouterOS 6.46.2 on hAP ac2.
screen shot - WinBox v6.46.2 on hAP ac^2 (arm).png

2

You should report it at “Winbox v3.21 released!”