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.
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.