Thanks to your video, but I really don't know how to solve it.
For pitlane's ending, it's intentional, in order to let ai not crash in tunnel.
I've done some digging into AssettoCorsaMods.net and I've found some early documentation:
Timing:
These objects don't need the axis orientation like the spawn objects
AC_TIME_0_L
This must be placed on the LEFT side of the start/finish
AC_TIME_0_R
This must be placed on the RIGHT side of the start/finish
AC_TIME_1_L
AC_TIME_1_R
Same rule about left and right but it will became the first intermediate.
AC_TIME_2_L
AC_TIME_2_R
The second intermediate.
You can place only 2 intermediates.
The trigger will be a line drawn from the center of the object to the other side (not visible obviously)
So there are "gates" that are labeled in the .kn5 editor called AC_TIME that are incorrectly placed. These indicates sectors on a track marked as "circuit" in tags and goes from start to finish in the same place (another reminder to please add the "circuit" tag to your tracks in future updates, it is important).
I'm going to try and open it myself and see if I can find the problem, although I have no further reference and haven't opened a track in kseditor before. I'll let you know if I find the issue.
EDIT: I've found the AC_TIME variable, it's in the "grid.kn5", which needs to be unpacked after the "yas_marina.kn5" model and then opened as an FBX file in KSEditor. In here, all the timing and positioning data for the track is stored. I assume that AC_TIME 2/3/ etc. here is misplaced.
I am trying to figure out how to move these "AC_TIME" blocks in grid.kn5 (or any blocks for that matter, so pit slots, grid slots, etc.), but I can't figure it out at the moment. Any help from those in the know will be appreciated. I think it's safe to assume these elements are not created in Blender itself but in the KSEditor, I just can't figure out how to control them.
EDIT2: The sector "blocks" in the KSEditor view of grid.kn5 are definitely placed incorrectly. They're out of order (AC_TIME 2 is where AC_TIME 1 should be, hence the timing breaking) and they're not in the right place on the actual track itself. See this map for where the actual sectors should be: