It's a bit hit and miss whether such changes make it into the planners. Sometimes they do, sometimes they don't, not even in their own planner, which will then show trains that don't run, with a link to a PDF with the replacement buses.
Yes, that has been my impression this weekend
I went Villach>Ljubljana>Rijeka and back. On their own website their is a section of disruptions which clearly lists that there would be replacement buses Kranj>Ljubljana and Ljubljana>Logatec this weekend with a full timetable. On OBB scotty it also gives a warning for the kranj>Ljubljana leg but still gives the normal timetable and no mention of the Ljubljana>Logatec closure at all
Within their own planners you can only search for local stops but selecting those it just shows the normal timetable and even their live tracker shows magically the trains running through those stations (to be fair it says it is not using gps but it did make me wonder it's purpose)
But to be fair, everything worked perfectly, the buses were there and didn't really take any longer than the trains anyway so certainly no complaints, just interesting from an information perspective
They're saying the night trains to Budapest are running as normal despite running through the Logatec section so I'm curious as to whether that is the case or not