Wrong password encoding soap request with basic auth

Hey there,

I am using Soap Ui 5.5.0 on MAC and found out that the password encoding does not work correctly when using Basic auth with

"Pre-emptive auth: Use global-preference"

Special characters like § are not encoded correctly

but when using "Authenticate pre-emptively" everything works fine

Soap Ui is freshly installed and I did not change any configurations.

I tried setting -Dfile.encoding=UTF-8 in vmoptions.txt but it did not help.

Also manually encoding the password and setting the authorization headers manually works fine.