Due to a bug
[https://community.ui.com/releases/UniFi-Network-Application-7-0-20/3e4a4099-c063-42f6-8e21-5fb2c99fcea9#comment/f246c840-3422-4d36-a028-0becfe53e5a7]
, and despite my cloudkey being set to only update official (stable) releases,
the network app was updated from 6.5.55 to 7.0.20 and subsequent RC builds.
This issue was caused by:
* Enabling automatic updates