So no points at all are returned, hmm I am not at the PC again for a week, so cannot try to replicate the error. But I do have a few thoughts at least.
I recall Ceiling Plans having a different associations with respect to levels and workplanes than ordinary plan views, but can’t find a link to that information at the moment, I will keep looking. 
In the meantime, have you tried setting the sketchplane to be the active view before picking the points? Similar to what I have described here: