In time interval, trains will reserve the tile on which the next stop signal is located. This can be observed on the trunk section immediately west of Fleckesmouth Road on my "Broken time interval 6" save from previous bug reports.
Thank you for your report. I think that I have now fixed this.
I prioritised this because I thought that this might have been involved in the bug causing the congestion on the server, but having looked into this in more detail, I suspect that this is not that bug. Nonetheless, I should be grateful if you could re-test to confirm whether this has been fixed.