zsh-autocomplete: Cursor position incorrect when "unambiguous" substring is inserted

• zsh-autocomplete version: 3f938bb7b4e36c05fcae172360c20c9dfa6e7bb5
• Zsh version: zsh-5.8-0-g77d203f
• Framework: none
• Plugin manager: none

$ zstyle ':autocomplete:tab:*' insert-unambiguous yes
$ source path/to/zsh-autocomplete.plugin.zsh

When insert-unambiguous is set and non-alphanumerical characters in the file names suggested, all similar parts are inserted upon the <TAB>.

touch qwe-123-rty qwe-456-rty
file q<TAB> -> file qwe--rty

In the example above, since 123 and 456 are the only different parts of the file names, only those are excluded from what is inserted.

file q<TAB>1<TAB>

# should make
file qwe-
file qwe-123-rty

# but actually makes
file qwe--rty
file qwe--rty1