Something has been changed to the texture reflection feature since STK v1.3. I think it was motivated by the this issue: https://github.com/supertuxkart/stk-code/pull/4575 . While these changes seem to work better in that single case, reflections now have disappeared from most other tracks. This affects my track Dyson Speedway as well as some others like skindoormimizs Waphin. Most standard tracks are rather bright, so I guess that's why no one else really cared about this before.
To get visible reflections you now have to set them to almost maximum (red PBR texture with almost full saturation). This makes it harder to adjust the strength of the reflections, because the range for the adjustment is much smaller. Before the full range (0-255) was usable and now it is down to rather 200-255.
Most important for my work is, if this is something that happened unintended and will be fixed in future or if this is the new state of the art of using reflections in STK?
For the new version of Dyson Speedway (https://forum.freegamedev.net/viewtopic ... 18&t=18044) I'm currently thinking of doubling certain parts of the track and using scripting to ask for the users STK version. Otherwise either STK v1.3 users have hardly any reflections at all or STK v1.2 and lower (and I'm sure there still are many) have extreme reflections on track which can be disturbing.