Onedrive API is available for personal users the same as before - nothing has changed. Your thread title is simply FUD or click bait.
Not sure why you think that it is rclone bug. What in your opinion rclone should "fix" here?
Microsoft has changed some rules of the game and now to provision personal client_id/secret you have to follow different path. Any issues with this you can complain to Microsoft.
You can use rclone built in client_id or as before use personal clinet_id you can get from Microsoft using supported method(s).
PS. This problem is nothing new and has been discussed before: