Are you sure you haven't clicked on the coupler icon again? The icons disappear on uncoupling here and highlight when you click the couple icon on the HUD.
I just tested it again taking care not to click any icon more than once and the result is the same.
EDIT: The ghost icons do disappear when I reverse the loco to couple with the wagons. Then if I repeat the process, everything works as it should.
EDIT 2: Bug report submitted.
EDIT 3: Curioser and curioser. I have just rerun the test on a second computer. It seems that the issue might be ACS related. When run using non GWR and non ACS rolling stock there is no problem. When GWR rolling stock using the ACS equipment is used, the problem occurs.
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