After upgrading to Plasma 6, krdc can not connect to VNC hosts anymore.

When trying to connect, krdc goes straight to a blue screen.
After that, if trying to disconnect, the program freezes and the only way out
is to kill the application.

The behavior is the same regardless of what string is typed in the address
field: i.e. the lock must happen quite early in the program.

This still happens in tw 20240325 with krdc 24.02.1.

A workaround so far is to use an alternative VNC viewer, such as tigervnc.