`a` `i` will not enter the insert mode occasionally, but `A` `I` will

This issue happens occasionally.
I have found this issue after updating plug on 19th April。
My last update date is 17th March. So maybe the commits in this period caused this issue。

Some related  settings in my .zshrc below
```bash
zinit ice depth=1
zinit light jeffreytse/zsh-vi-mode
set -o vi
bindkey '^@' autosuggest-accept
```
