So I just logged in and had 56 Runed Harbinger crests all of a sudden.
Thought that delves must be bugged since I only ever got 2 crests from my first tier 8 delve.
Guess they must have hotfixed to retroactively give all the crests i should have gotten across my +20 tier 8 delves I have done this week.
Not seen a single mention of this, but nice change.
I got 8 on my shaman that had only done 4 runs yesterday and nothing more, but my druid and evoker got nothing although they have done more than 16 runs each.