uBlock does not appear to honor overriding default assets.json via Chrome policy

[mikelagasse]

Prerequisites

• I verified that this is not a filter issue
  • Filter issues MUST be reported at filter issue tracker
• This is not a support issue or a question
  • Support issues and questions are handled at /r/uBlockOrigin
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
  • Your issue may already be reported.
• I tried to reproduce the issue when...
  • uBlock Origin is the only extension
  • uBlock Origin with default lists/settings
  • using a new, unmodified browser profile
• I am running the latest version of uBlock Origin
• I checked the documentation to understand that the issue I report is not a normal behavior

Description

Attempting to designate our own default assets.json via Chrome policy (per https://github.com/gorhill/uBlock/wiki/Deploying-uBlock-Origin#modifying-the-list-of-stock-assets) doesn't seem to function as expected.
In my debugging, I see that the URL we designated for the location of our default assets.json is parsed by storage.js but I don't actually see our assets.json attempt to get pulled from the webserver as I believe it's designed to in assets.js. Instead, it uses the bundled assets.json.

A specific URL where the issue occurs

[A specific URL is MANDATORY for issue happening on a web page, even if it happens "everywhere"]

Steps to Reproduce

1. Set Chrome extension policy via registry
   Key: HKLM\Software\Policies\Google\Chrome\3rdparty\extensions\cjpalhdlnbpafiamejdnhcphjbkeiagm\policy
   adminSettings with value {"timeStamp":1562713627423,"version":"1.20.0","assetsBootstrapLocation":"https://my-url-here.com/assets.json"}
2. Install uBlock Origin
3. View settings and see only default assets.json is loaded

Expected behavior:

We expect the our designated custom assets.json to be loaded from the URL we specify.

Actual behavior:

The extension's bundled assets/assets.json is loaded.

Your environment

• uBlock Origin version: 1.20.0
• Browser Name and version: Chrome 75.0.3770.100
• Operating System and version: Window 10

[gorhill]

I never really completed usage of assetsBootstrapLocation through admin settings. I have fixed this locally, but I do not want to hold back the current release candidate -- the change needs to be tested through a beta build, so I will have to publish it once current release candidate reaches stable release.

[mikelagasse]

Thanks, we'd be very interested in helping test the beta build when it's available!

[gorhill]

You can try the fix in the latest dev build: https://github.com/gorhill/uBlock/releases

[mikelagasse]

Can confirm this build works as expected, thanks!