Error when run UI in DEV mode

[orblazer]

Version

3.6.0

Environment info

System:
    OS: Linux 5.0 Antergos Linux
    CPU: (4) x64 Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
  Binaries:
    Node: 11.14.0 - /usr/bin/node
    Yarn: 1.15.2 - /usr/bin/yarn
    npm: 6.9.0 - /usr/bin/npm
  Browsers:
    Chrome: Not Found
    Firefox: 66.0.3
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

1. Install Vue CLI with yarn global add @vue/cli
2. Run Vue CLI UI with vue ui -D
3. Import an project
4. Restart Vue CLI UI

What is expected?

The widget loaded and the project keeped

What is actually happening?

The widget is not loaded (error : Component load timeout) and the project is absent (need re import the project and re configure the widget)

[haoqunjiang]

Just released v3.6.1. Does this bug still exist (without the -D flag)?