I'm replaying DSII before DSIII comes out, and since I'm trying out the Deathinitive edition, I'm also trying the DLC.

I got to the puzzle where you're supposed to use the Soul Slitter and then use one form to open an underwater grate for the other form to swim through.

My problem is... in that pool, my dive command doesn't work!

I went back to the main campaign and tried swimming in the Fjord, and it works as normal. But in the DLC it appears blocked.

Anyone else encounter this issue?

Edit: found the solution on steam- when using Soul Splitter, the swimming controls revert to default, so diving gets remapped to the RMB.