So I was testing a scenario and when I got to the feather signal it said I was going to go onto platform 4A even though in game it said I was going to 1B so when you arrive into 4A it spads you at signal HU121
I've been having same problem but found a temporary fix. Start from Leeds siding 0. It means you can't stop at Huddersfield but at least you can get beyond there!. Not ideal I know and takes away the realism on a passenger service but will do until/if it gets fixed.