Hello Zach Anthony,
I still have the same problem for some locations in manifest.json. Here, what I have in my app, and it doesn't work:


"location": {
  "support": {
    "nav_bar": {
      "url": "assets/index.html#location=nav_bar",
      "autoHide": true
    },
    "ticket_sidebar": { "autoLoad": false },
    "new_ticket_sidebar": { "autoLoad": false },
    "background": {
      "url": "assets/index.html#location=background"
    }
  }
}

I played around, and found two cases when it works:

"location": {
  "support": {
    "nav_bar": {
      "url": "assets/index.html#location=nav_bar"
    },
    "ticket_sidebar": { 
      "url": "assets/index.html#location=nav_bar" 
    }
  }
}

"location": {
  "support": {
    "nav_bar": {
      "url": "assets/index.html#location=nav_bar",
      "autoHide": true
    },
    "background": {
      "url": "assets/index.html#location=background"
    }
  }
}

It looks like apps with location { "autoLoad": false } break local development.

Best regards,
Andriy