I’m using the same Brave version as you do, and I never had this issue and couldn’t replicate it.
It sounds like a really dumb question, but did you check your internet connection and performed a page reload? Also, if you are on another Network (i.e. work/ home …), there are some websites blocked. So it could be that if you’re at home it works and at work it doesn’t because the IT department has blocked Brave News on the network.
I know about this kind of issues and I know that this is not the problem. I have followed more than 100 sources and brave news on other profiles in the same device and browser are working properly. I also mentioned that it is automatically resolved and again happened 2-3 times past week on the same profile.
Hmm that sounds weird. I would back up my data and reinstall it or a downgrade to a previous version where it worked, since I can’t help you more, sorry. Try contacting an admin of this forum and let them help you.
To help others with the same issue, you can post your solution here and mark it as resolved.