Where is the old jump history feature

In an earlier version of my neovim/config I was able to hit <ctrl-o> and <ctrl-i> to jump through my edit history. A feature that I particularly enjoyed was how the history included closed buffers. That way, I could jump to a place I had recently closed.

I have the bindings up and running but the history excludes closed buffers. Does anyone know how to restore the inclusion of closed buffers?