6.6.0 RC3 ssh with zsh Weirdness

Since upgrading to 6.6 I've been having weird things with zsh and tab completion and backspacing. It's hard to show without experiencing it but when I backspace it spaces to the right on the local terminal rather than moving the cursor to the left and removing the character. Also, when I use the tab completion it sometimes inserts an extra "/" on the local terminal. This doesn't seem to affect bash. What's going on?

Last login: Fri Sep 14 10:52:56 2018 from 192.168.22.196
Linux 4.18.7-unRAID.
 ⚡ root@unRAID  ~  cd /mnt//user/viMovies/
user/   user0/
 ⚡ root@unRAID  ~  cd /mnt/user/media//videos//T tTV//.grab/
 ⚡ root@unRAID  /mnt/user/media/videos/TV/.grab  cd
 ⚡ root@unRAID  ~  bash
%n@%m:%~%# cd /mnt/user/media/videos/TV/.grab/
%n@%m:%~%# cd
%n@%m:%~%#