When using both Extra Bows (1.15.1 b1) and More Enchantments (1.8.4) together, the client crashes.
https://gist.github.com/Diamondman121314/b270d11ee2eebc472fca332fa65979c1

same for me: Crash report: https://paste.ee/p/7WgHP

Same for me AND it does it with b2 also More Enchantments of any version and Extra Bows of any version has this same conflict.
https://pastebin.com/HU9NNWrR
I can give some clarity on this. The root of the crash is a conflict with the arrow enchantments.

I am very sorry that I answer so late but is this bug still present?