Architecture: WiFi support for WiFi enabled boards ...

Wifi.setConfig({mode : "sta+ap"});

setConfig does not take a "mode" param, and the docs are correct. But I can see how this is confusing to an esp8266 coder. the "opmode" is only changed indirectly by connect/scan/disconnect/startAP/stopAP.

mode is changing when changing phy and powersave like this ?!

Mhh, I'll have to look into this and see whether I can repro.
Update: I cannot repro. Can you help me understand how you get there?

and this dumps

Ooops, not good. Looks like a WDT reset, so something must take too long... I'll have to try and repro...
Update: repro is easy, bad DBG printout, and clearly a gap in the test coverage...

Thanks much for testing!!!