How do I solve dart code completion issue

What happened?

When I input ( or { in dart-mode, completion items are shown even though I input only 1 character while company-minimum-prefix-length is 2

What did you expect to happen?

Completion items are not shown until 2 characters are input.

Steps to reproduce

This is my settings repository.

It reproduces every time while editing .dart . It doesn’t reproduce in any other file types.

System information

https://pastebin.com/D1jSbLdt

This is copied from Completion items are shown before `company-minimum-prefix-length` when I input `{` or `(`. · Issue #6499 · doomemacs/doomemacs · GitHub. C-h v company-insertion-triggers doesn’t works for me.