I made the setup pictured in the screenshot to try to have a self limiting system for feeding endoflames over a larger area but it appears the flowers won't pick up items from stacks that are moving/being moved. Is this a bug, by design, or a limitation of Minecraft? The green blocks are slime channel from Tinkers' Construct and work like flowing water to push items around without the mess of using water.

For the record Endoflames will pull items out of water or that are being pushed by daffomills but not slime channels.

Yes, so it's exactly as I said, non-issue then.

They have a ticker before they can pick up items. What I assume is happening is that the slime channels are resetting it so the items don't despawn. If you can reproduce this with water or daffomills I'll reopen.