My router is IpFire.
Now, something strange happened.
I needed the 7″ display for another project, so I moved the SD card to another Raspi, thinking to run Max2Play headless.
And indeed it does, wifi and BT work as usual, web interface is loaded, but.. lo and behold! now it has only ONE IP address.
It seems related to hardware, since the SD card was just swapped from a Raspi with display to another one without.
However, I can’t figure out the reason.