In this save, trains can be observed first reserving a path into the northernmost platform despite it being occupied, then reserving a path to an alternative platform and following that one. The previous reservation is only cleared after departure from the station. A similar bug can also be observed when a terminating train tries to depart west while the path to the exit signal is occupied. The train will reserve as far as the distant signal and depart, then stop at the platform signal and wait until the path to the exit signal is effectively clear.
.sve: https://simutrans-germany.com/files/upload/Broken_time_interval_6.sve
Thank you for your report - I believe that I have now fixed this. I should be grateful if you could re-test and confirm whether this has now been fixed with the next nightly build.