I think you're probably right Nathual. 

Let's hope these issues could be fixed soon...

In fact, many players including me almost got none of them.

As of now, I'm not sure whether they have never dropped, or they got lost after mission. I tend to believe the former case.

I guess not, but I'm not entirely sure.

1. For the no drop from median enemies  problem, I've run one or two Mech missions with large amount of drops after the new patch, the dropping seems to behave normal.

I guess the 2.4.1 patch somehow fixed this. But the true test remained to be seen, when the next "Week of the Hoard" comes. 

2.  For the item lost after mission issue, I didn't find this issue myself, some other player provided that video but he's been away from keyboard for a while.

3. For the ivory shard drop problem, I still can't believe I had such bad luck LOL.

My shard collection for my seasonal character  is now:

2,10,3,7,33,51,77,117,191, from ivory to crimson. It looks suspicious to me because it's increasing in an arbitrary way.

I didn't run much void crusade this season,  and I seldom turn shards into dust, so these severly unbalanced numbers are what I got from drops.

You may wish to look into more accounts to check if similar things happen at large scale.

Maybe something other than dropping  is wrong? I don't have an idea, hope you guys find the answer soon.....

Hi Marco：

I think the dropping issue is ameliorated (most enemies drop normally now), but not totally gone (for seasonal skull).

To be more specific:

After many items have been dropped (and  perhaps, with many items lay on ground, which is very likely to happen if players choose not to pick items below relic) , there is high chance that nothing would drop from the seasonal skull, especially if the skull is summoned from seasonal temple.

This might be reproduced by:

a. Open an intel mission and turns it into Seasonal boss mission, the Purge one might be easier  to find this problem.

b. Set tarot : "The Arch Enemy" (which increases item dropping) .

c. Set auto-pick : not picking items below relic.

d. Kill most enemies in the mission. 

e. Summon a seasonal skull from the temple near the end of the map, kill it and see if it drops.

2. The void crusade shard drop rate is still not balanced. Confirmed from new players that join the game in this October

Some new issues:

3. It seems no villains could be generated in one of the Seasonal Boss mission (the Callous Hunt one), even with the tarot effect:＂＋2 villains in the mission＂.

4. Also strangely, some players found if they group in size of 3-4 people,  there is high chance that their loot would be gone after mission.

Hope these information helps.