Steam "zws" Is Not Not Working With Br101 Expert And Flixtrain Coaches

Hello DTG Community,

I've put together a formation consisting of the BR101 Expert cab car, several second-class coaches (Expert), a Flixtrain coach (used as the "Bordbistro"), two first-class coaches (Expert), and a BR101 Expert locomotive. Unfortunately, the cab car isn't connecting properly to the BR101, even though "ZWS" is activated in the locomotive. When I sit in the cab car, the game displays "Avmmz 106.1" in the pause menu, indicating that the Flixtrain coach is disrupting the functionality of the formation.