Cura LE Version: 3.6.9
Operating System: Debian (AO internal)
Printer: Taz Pro (Quiver)
Tool Head: Taz Pro Dual Extruder
Description of issue: Toolhead 2 does not have physical access to the full build plate, it is limited on the left side. If you set a model to print with extruder 2, Cura will take this into account and prevent you from using the inaccessible part of the build plate. However, when no model is set to extruder 2, but extruder 2 is used for support, this protection is not activated.
Steps to reproduce: Open any model, scale to max. Enable supports, and set support extruder to toolhead 2.
FYI this came from an external issue, but the cause was internally investigated by myself and @karrad