The first preference added to the branch is removed if the second one added was identical at any point

[SoftVision-SimonaRosu]

[Prerequisites]:

• Have the Firefox browser installed.
• Have the Normandy Devtools V2.3.1 addon installed.
• Have VPN access to the staging environment.

[Steps to reproduce]:

1. Open the Normandy Devtools and choose the Stage environment.
2. Create a new multi-preference-experiment and populate the fields with valid data.
3. Add a preference to the “Branch” section. (e.g. “browser.newtabpage.activity-stream.showSearch_c”)
4. Add same preference a second time and add extra characters to it (e.g. “browser.newtabpage.activity-stream.showSearch_cbd”)
5. Click the "Save" button and observe the behavior.

[Expected result]:

• Both preferences are correctly added to the branch and the recipe is successfully saved.

[Actual result]:

• Only the second preference added to the branch is saved.

[Notes]:

• This issue is reproducible when creating a new experiment or editing an existing one.
• This issue is not reproducible using the “preference-rollout” recipe type.
• Attached a screen recording of the issue:

[mythmon]

Is this a UI bug, or a server bug? UI bugs should be filed in the NDT repo. If it is a server bug, you could tell by looking at the network panel as you save the recipe. If the data sent to the server has the expected data, it is a server bug. If the data sent in the request is not the expected data, then this is a UI bug, and I can transfer it for you.

Open the browser and navigate to "delivery-console.stage.mozaws.net".

Delivery Console is gone now.

[SoftVision-SimonaRosu]

Sorry for the mistake, I’ve meant the Normandy Devtools. I will update the summary of this issue. I have retested this issue with the Network panel open and I can confirm to you that when pressing the “Save” button a “404” request is sent. There are also “200” requests, in which the initial pref was replaced from the recipe’s schema.

[mythmon]

I've made an issue on the NDT repository for this.