Load new content button doesn't appear to work, and remains after click

[stephendonner]

Description

Load new content button doesn't appear to work, and remains after click

This is pretty similar to #20409, but that's on Android

Steps to Reproduce

1. install 1.47.14
2. launch Brave
3. open brave://flags
4. set brave://flags/#brave-news-v2 to Enabled
5. click Relaunch
6. open a new-tab page
7. click Customize
8. click Turn on Brave News
9. click on Follow on the Brave channel
10. click to Unfollow the Top Sources category/channel
11. dismiss the dialog
12. wait
13. when it appears, click on Load new content
14. nothing (seemingly) happens

Actual result:

Nothing seems to happen, and the Load new content button doesn't dismiss, either

Expected result:

It should at least dismiss, if it can't find new content

Reproduces how often:

100%

Brave version (brave://version info)

Brave	1.47.14 Chromium: 107.0.5304.62 (Official Build) nightly (x86_64)
Revision	1eec40d3a5764881c92085aaee66d25075c159aa-refs/branch-heads/5304@{#942}
OS	macOS Version 11.7.1 (Build 20G918)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc @mattmcalister @rebron @fallaciousreasoning @petemill @srirambv

[fallaciousreasoning]

I think this should be fixed now the backend has been updated. I just tested and couldn't reproduce.