It’s a feature of setting sys-net up as a disposable qube.
To have your wifi connection persist, find your <ACCESS_POINT>.nmconnection file in sys-net
find / -type f -name "*.nmconnection"
and copy it into the disposable template (e.g., <DEFAULT-DVM>). Then, in the disposable template create the following folder
mkdir -p /rw/config/NM-system-connections/
and copy the file there, where it will persist. Finally, add the following line to /rw/config/rc.local:
echo "nmcli connection up <ACCESS_POINT>" >> /rw/config/rc.local