KDE Network Manager doesn't allow editing of a Bluetooth dun connection

Leap 15.1

The other day I had the need to connect to the Internet via my mobile,
so having torn my hair out for a good twenty minutes trying and failing
to create a mobile broadband connection via USB, I changed tack and
looked in the Bluetooth settings. There I was able to configure a dun
connection by selecting my country/operator, and it worked.

However, now on every boot/resume it tries to autoconnect to this
bluetooth network. I reviewed the settings in KDE Network Connections,
changed the priority to -1, unchecked 'Automatically connect to this
network when it is available', but it's not possible to save these
settings, neither with the Apply, OK buttons nor by selecting another
network and hoping to be prompted, as happens on any other connection I
change. The Apply button remains greyed out no matter what changes I
make to the bluetooth connection.

My only choice hence is to completely delete the connection and to have
to recreate it every time I might need it, because on my free mobile
contract I only get 50mb of data per month, the rest is charged
out-of-contract. I can't risk being unknowingly connected and running up
a huge bill!

I assume this is a bug but should it go upstream? Can anybody reproduce it?

gumb
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