The official update notes for the January 21, 2020 Battle for Azeroth Season 4 update have arrived.
Read them here.
This thread was added on January 17, 2020, with posts from Nethaera.
We’ll post about hotfixes as they happen. I can’t comment on the issue you mention specifically though right now.
That was added in here in error. It’s been removed since Ulmath was introduced with Rise of Aszhara. Sorry for the confusion.