In my long running route spanning versions since TRS2004, I noticed that in some parts, the track seems to be reluctant to appear, Trains still see them since the continue driving over seemingly trackless terrain. In the following sequence of images, the ground has been set to transparent, in case there was anything underground.
As it appears up close, zoomed out just before the blue lines, zoomed out showing the blue track lines

As it appears up close, zoomed out just before the blue lines, zoomed out showing the blue track lines

As it appears up close, zoomed out showing the blue track lines

Any ideas what could cause this behavior?
Knowing that leaving the built-in rulers in the route can have a very detrimental effect on performance, I have been removing them whenever I find them, in case they are contributing to this issue.
As it appears up close, zoomed out just before the blue lines, zoomed out showing the blue track lines



As it appears up close, zoomed out just before the blue lines, zoomed out showing the blue track lines



As it appears up close, zoomed out showing the blue track lines


Any ideas what could cause this behavior?
Knowing that leaving the built-in rulers in the route can have a very detrimental effect on performance, I have been removing them whenever I find them, in case they are contributing to this issue.