Zeroconf/mDNS does not work in PrusaSlicer on some ESPs

Printer does not appear in PrusaSlicer. (Tested with **ESP32** on Ender-2)
The exact same firmware on ESP8266 __does__ show up in PrusaSlicer. What gives? (Tested with **ESP8266** on RF100)

Does this mean that something about Zeroconf is fishy in ESP32? (It does show up in Avahi though...)

Time to get out Wireshark?