Changing covenants removed "Castle Nathria: Getting a Head" from my quest log

Title.

Having a week-long ticket discussion with Blizzard CS suggests this is a widely known issue with several reports but they are refusing to provide refunds for heads to anyone affected by this issue.

I lost three weeks of progress for both Sludgefist Normal and Heroic and it’s very much problematic for me if I don’t unlock both skips this coming February. (Job and etc…)

It’s genuinely becoming increasingly infuriating and honestly making me reconsider unsubscribing.