I'm using MineCraft 1.12.2 and Ender Utilities 1.12.2-0.7.11.
When I'm in the Nether and my Item Pickup Manager is linked to a chest in the overworld, an I put an Item into the transfer slot it just stays there an is not transferred. The capacitator is fully charged. I also tested The End and a RFTools dimension. I have an Energy Bridge Transmitter in the End and a Receiver in the Overworld. The pickup manager has one link crystal installed which is linked to a chest in the Overworld and the transport works onliy local to this dimension.

I believe that this worked interdimensionally in some earlier versions.

Do I miss something here or is that really a bug?

It is meant to be working for sure, I'll have to look into it. Is there anything special about the target inventory? Or is it just a vanilla chest for example?

How close to the target were you in these cases, ie. was the target Chest within the player's loaded chunks or outside them?

Yes it is just a vanilla chest. Well that is connected via Makanism pipes to a ProjectE condenser.
But the transport works if I'm in the overworld so it's not completely broken.
I will test, if the transport works in the Nether locally and report back.
Okay, I checked it. Items are transported within the same dimension but not interdimensionally.

Well, my first tests were quite close to the target. I just tested it from about 500 blocks away and it worked. My base is chunkloaded with PersistentBits-Chunkloader.
Hope that helps.

I just loaded an older world and there it works. This one had EnderUtilities 0.7.8. It stopped working after I updated to 0.7.11.
So there was a bug introduced after 07.8.
Hope that helps.

Okay I found the issue. In 0.7.9 I had a commit for cleaning up some of the code in the IPM item, and I switched into using an existing util method for getting the bound inventory. But I didn't notice that the util method also had the check for the Advanced Ender Core in it, since it was previously only used in the Ender Tool and Sword items... And since the IPM doesn't use/have that module, the cross-dimensional bound inventory access always failed due to that check.