Hi, we were not aware of a similar problem.
I just rendered a couple of our test scenes, and everything seems normal. Using Max 2023, latest V-Ray, Forest and RailClone updates.
But perhaps the problem occurs only with some specific feature, which we are not using here.
Please, would you create a simplificated scene, with only the Forest objects and test it ?
If problem is reproducible, please
send us the files so we can test it.
We know you are very busy with your work, and testing and preparing scenes may be cumbersome. But if there is any problem with the software, we are the first interested to reproduce and fix it.
Thanks for your collaboration.