Quite simple, after throwing the Lasso onto a villager from Minecolonies, the world save crashed.

https://alexs-mobs-bestiary.fandom.com/wiki/Vine_Lasso
https://www.curseforge.com/minecraft/mc-mods/minecolonies

Updated info for vine lasso link as wiki data was ported: https://alexs-mobs-unofficial.fandom.com/wiki/Vine_Lasso
Recommended workaround for packs with minecolonies would be to remove the item recipe and jei entry.