When I put certain items (an engineer's toolbox from immersive engineering and an ender staff from reliquary in my case) into the anti barrel, I can't take it out. If I try, it goes into my inventory, but is just there as a ghost item (picking it up will result in it vanishing). When I look into the anti barrel again, the item is still in there.

I am playing on the current version of Modern Skyblock 3.

I'm also seeing this bug, getting it with "Engineer's Blueprint" from Immersive Engineering and "Ender Staff" from Reliquary. Also, further testing shows I can remove them by putting a hopper under it and sucking them out into a chest... then they behave normally, but if I pull them out to my inventory, not so much.

(Also Playing Modern Skyblock 3 current version as of 11/4/18)