Strongboxes, Chests in maps and delves come up EMPTY. ref 1,709,804,383

I had this weird thing happen maybe 10 times so far in Kalandra league.

Delve target says 'contains gems', i finish it, pop the chest, absolutely nothing comes out. Not a single gem, or other items.

Next time i finished strongboxes delve, i upgraded them to 20% quality and alched to rare - out of 3 strongboxes - first two were EMPTY, last one produced some stuff.

Then i was in an Unique map, T16, upgraded the Gemcutter's strongbox to 20%/rare... yes, empty again.

guess i have to bear with getting trash or nothing at all now

PS: i do have itemfilter, and i did press Alt to confirm that NOTHING CAME OUT

attached picture: two strongboxes are open, one isn't yet.
note: I'm holding Alt here
https://imgur.com/nXrsuXV

Just had an exact same trouble - 3 delve strongboxes, upgraded to rare, only the last one contained any items in it.

What kind of reward is that.

Bug? No bug? Hello?

z, alt, i tried it all, no single white item, my item filter is not at all strict

also, hiding with z will still leave items visible thrown around the ground, which is not the case on picrelated

also, the third strongbox, two weeks ago and yesterday did produce some loot, so no, it is not items visibility in blame here

What happens is that the first 2 strongbox loot is vacuumed into the delve machine as the encounter is not technically completed yet but the last strongbox to be completed completes the run so it drops normally.

I got 3 diviners strongboxes and the delve machine at the end of the encounter dropped a lot of div cards; I'd say about 2 div card strongboxes worth ;P