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postmarketOS is based on Alpine Linux and this site's knowledge article for Alpine applies to postmarketOS as well.
By default, postmarketOS will generate a random software MAC address when connecting to a new WLAN network.
You can disable this by adding a NetworkManager rule.
In /etc/NetworkManager/conf.d/
you can make a file with any name that has the following:
[device]
wifi.scan-rand-mac-address=no
On a live system you can then rc-service networkmanager restart
to restart NetworkManager and have it load the new configuration.