watch is not working correctly

[zzzz465]

folder structure

api
- api/foo.js
- api.bar.js
- doc
- - main.js
- routes
- - mailgun.js

with this folder structure, glob pattern api/{*.{js,ts},!(doc)/**/*.{js,ts}} should watch every js,ts files under api/ except in api/doc folder.
but instead of doing that, it only watches api/*.js, api/*.ts files

test result Link here