It would be pretty neat if Minecraft wouldn't refuse to connect to (W)LAN IPs just because the device is "not connected to a Wi-Fi network" even though the phone is either a Wi-Fi hotspot, or has a Wi-Fi Direct connection established.

The game is able to detect a running game in progress from another device in (W)LAN during Wi-Fi Direct connection, but refuses to connect.
Using a hotspot works only for a device that is not a hotspot, since the device that owns such hotspot is not allowed to connect under basis that it is "not connected with Wi-Fi". Devices that have linked themselves to the hotspot can join the host normally.

Screenshots available, but only informational.

Thank you!