[MC-134913] Cannot pick up items dropped by mobs

First observed in a world created in 1.12, on a server.

Server updated to 18w30a.

Killed a few mobs but could not pick up their dropped items.

Can pick up mined blocks and thrown items.

UPDATE: same behaviour observed in a single-player local world, followed by a crash.

Linked issues

Can you confirm this too when upgrading the world from 1.12 to 1.13 ?

KevinTheDruid 2018-07-26T09:29:27Z

Singleplayer world upgraded from 1.12.2 to 1.13, played in 1.13, does not exhibit this issue.

Yes, it's MC-134816

KevinTheDruid 2018-07-26T09:33:09Z

MC-134816 doesn't mention not being able to pick up, and in my case it does not always crash. I think the not picking up is a separate issue.

Reproduce:

Setup Command block to spawn cows:

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Spawn Cows:

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Kill Cows:

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SOME Items can't be picked up:

[media]

++ Confirmed in 18w30b