This one confused me for a little while!
The following command and comment works fine:
N0080 M10.2 (Post AVC On) (Part: 20200107 - Tray 1-490)
but this line causes UCCNC to start at Y = 1490mm:
N0080 M10.2 (Post AVC On) (Part: 20200107 - Tray 1 490)
Please see the attached sample GCODE files.
The only difference is the "-" in the comment.