Comment 7 for bug 1697312

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r.roeterdink (r-roeterdink) wrote : Re: System.NullReferenceException at Orts.Simulation.Signalling.SignalObject.getBlockState_pathBased(TCSubpathRoute thisRoute, TrainRouted thisTrain) (X3874, own route)

It looks to me that signal 5 is the signal protecting the section which is still occupied by train 1 - see image.
It could be that the changes cause a slight difference in timing such that train 1 is now in a slightly different position as it used to be.
It does not look like a signal error to me.