So I've been doing the optional dungeons and bosses as soon as I unlocked them and apparently my character is now over-leveled.

When I got to the first encounter of Jo Amon, it was the first time a main story encounter was truly challenging. He was at the same level as my character!

After about 2 hours, I finally defeated Jo Amon only to see the following cinematic proceed as if my character lost the fight! It was supposed to be a scripted loss! As Jo Amon kept saying my character is weak and has much to improve on, I kept saying to myself: "but I won!"

Someone recorded it: https://yewtu.be/watch?v=DxYjqLzlG1M

The only reward for accomplishing this is the ability to upgrade ultimate weapons early with that empty cough drop tin that's dropped!