Upon attempting to upgrade to Vim 8.0, I'm getting some funky output when running specs via vim-rspec. For reference I'll show you what it looks like for me under 7.4

When I upgrade to Vim 8.0, it looks as if the underlying buffer bleeds through the output before I dismiss it.

Additionally, I show in that demonstration that the same thing does not happen when I manually run rspec via straight shell execution (!)
Additionally, I'm customizing the rspec command like so (not sure if it's related)
let g:rspec_command = ':w | !clear && bin/rspec -I . {spec}'