Vault key event weekend and drop rate so far

Hey guys

This is the 1st vault key event since the explore update so I am not sure about gnome spawn rate, just want everyone input.

I have been doing explore difficulty level 12 for 1 hour since reset average 5 mins per 6 battles ( 4 normal battles, 1 mini boss and 1 mythic boss), roughly 70 battles and only two gnomes spawn. Spawn rate seems low compared to pre patch. How about u guys ?