Boss fight won't start Citadelle des morts

Welp spent a whole 3 hrs trying the EE The last step until the boss fight where I have to place the key on the statue didn't work for me at all. I placed it played some funky sfx and then just nothing. No zombie's spawned anymore either so I was just basically all alone in the map I believe it has something to do with me saving and quiting because I had another bug happen earlier in the EE with the 6 vase code step, one of the vases straight up didn't load the code and I had no idea what was so i was basically forced to save and quit to fix it. My theory as to why I think it maybe saving and quiting is because it appears that when you hop back into to a game of Citadelle Des Morts none of your quest items ,apart from the lighting rods, save to your inventory. so basically the game believes you still haven't gotten the swords or upgraded them. Which basically means that the games thinks you've skipped a bunch of steps and cheated. So thats mu theory as to why the game didn't allow me into the boss fight but I maybe wrong and it might just be some really stupid glitch. needs to be patched immediately cause its awful to spent almost 4 hrs on an EE only for something that is completely out of your control breaks and you can't continue.