Factorio Forums

In this rail configuration you can place a valid train stop although it does not show up on the visualization as being valid. Note that the station is valid as the lights are yellow and trains and pathfind to it. It can be placed from the map editor or via bots building the station from a ghost.

I either expect the visualization to show this position as being valid, or for the train station to be made invalid in this position (red lights).

Blueprint for above setup:

They are not missing. They are properly not rendering because you cannot manually place train stop here. Only way to get into that state is by first building the train stop (when all the indicators are drawn) and then build the curved rail. This has some possible consequences (86616) but it keeps rail building logic simple (no prevention of building curved rails if there is train stop inside of its bend).