Nagstamon 3.14 not starting since Plasma 6

[timodenissen]

Using Arch Linux with the most recent Plasma 6 update, Nagstamon 3.14 no longer starts.

Cleaning my configuration to make sure it's not a profile problem:

cd ~
mv .nagstamon{,_orig}

Starting Nagstamon from Konsole via nagstamon crashes:

QLayout: Attempting to add QLayout "" to StatusWindow "", which already has a layout
QThread: Destroyed while thread is still running
zsh: IOT instruction (core dumped)  nagstamon

Running from bash results in:

QLayout: Attempting to add QLayout "" to StatusWindow "", which already has a layout
QThread: Destroyed while thread is still running
Aborted (core dumped)

ps auxf | grep -i "nagstamon" shows no Nagstamon process is running.

Prior the Plasma 6 update (with Plasma 5.27) everything worked just fine.