see attached a small scene with one mesh object and one forest composed with 6 low poly objects.
The scene is saved from max 2014. In which is loading fine.
Last year we finally moved to 2020, and since then, we sometimes have various forest pro crashing in 2020 (while loading the scene).
With forest 6.2.2 in both Max.
I managed to isolate the scene crashing to that forest pro in this situation.
I'd be curious to understand what's causing it!