It looks like this

The Gcode does not even contain the layer the line is rendered wrong (Layer 144 in this example in the Gcode, as the Gcode starts counting at 0, the UI at 1 so layer 145 in the UI is layer 144 in the Gcode)
The wrong rendering only occurs after slicing, not if the generated Gcode is imported. It may only occur on the layer without extrusions.
This is an example of a project files that causes this if used with my cradle support Revision 0:
TestCradleRemvoePin.zip
As the only things I changed are in the engine, this wrong rendering of layers without extrusion is not really something I can fix. This issue only exists as a reference should others have the same problem