Annoying warnings while using Subversion with kwallet

I'm using Subversion on Linux with a repository hosted on a remote server (via https) and with kwallet as the password store. Everything works as expected except that each time I'm using something like svn commit or svn update from the KDE console, I get the warning

kf.windowsystem: Cannot use KWindowSystem without a QGuiApplication

although the command is still executed. I have added code to my ~/.bashrc to suppress this particular message, but I'd still like to know what's going wrong here. In case it matters: I'm using OpenSUSE Tumbleweed installed from snapshot 20250728 this week.