If I try to load up any modpack on any version it will just crash, however for some reason I can still run RL-Craft which has more mods than any modpack I install or create, I use the same two perfomance mods in every profile (OptiFine, Vanilla Fix).
It will fail to download the modpack and will just crash, how can a program crash if it hasn't even began to load?
you can't report what happened in the modified environment as a bug
If you need help with mods, why don't you ask in the modded mc discord ?