Bug when I hire a helper in RSM161 with Draper Stream 900 attached in trailer form

[jdibs]

- PC win10, fs19 v1.1.0.0
- Vehicle/Tool/Model/Object: RSM161 with Draper Stream 900 attached in trailer form
- Issue: The hire a worker option is enabled when the header is attached to the back as a trailer.
When you are pulling the the Draper Stream 900 as a trailer in the RSM161 you have the option to hire a worker. When you hire the worker the header turns from trailer form into header form and hooks onto the back of the harvester. (see video for visual)
- Singleplayer
- Steps to reproduce: 1. RSM161 harvester with Draper Stream 900 header as trailer behind it (maybe other harvester-trailer combinations too, haven't tried it). 2. Press hire worker button.
- Map Felsbrunn with quite a few mods, none are directly involved with the action as far as I can tell (have not tried with the mods disabled)

Video: https://www.youtube.com/watch?v=QIWycvkb8iQ