During the last war with the Japanese after completing all the sieges the Shogun was disbanded (not by me):

But this was popping up every day!
I'm at 100% but cannot annex:

And yet I cannot take any provinces in the peace!

I think this effectively ends my mission of WC. I'm either 1 or 3 (Novgorod) wars away from annexing everyone else and it's only 1841 so there's no way without this hiccup that I should not be able to do it. Does anyone know how to fix this?
And, this is the final world map:


But this was popping up every day!
I'm at 100% but cannot annex:

And yet I cannot take any provinces in the peace!

I think this effectively ends my mission of WC. I'm either 1 or 3 (Novgorod) wars away from annexing everyone else and it's only 1841 so there's no way without this hiccup that I should not be able to do it. Does anyone know how to fix this?
And, this is the final world map:
