OK, I downloaded the track again from Legion's site and compared with what I had. Just going by the files, I see that some of the kn5 files were newer in my version and I have this .ini file in tracks (not loaded) from
AUTHOR = Benner900, Peter Boese (seasons), leBluem, Sliderman
VERSION = 1.3
DATE_RELEASE = 07 jan 2020
(file attached, just remove the .txt bit).
Since I don't know what changes what exactly, I uploaded the track I have installed here (hope Legion won't mind).
I tried the three layouts again and had no issues with grass etc. Only a small part between track and kerbs seems to be reflective and iirc that wasn't there before. I don't know how to fix that but it isn't too intrusive. Maybe someone can help.
Here's the track, hope it works for you.
I'll leave it here for a while.
https://mega.nz/folder/DOoDxAiD#S3QZi7A2cuWqFARZgeVNcg