Describe the bug

The bug is simple, the IO Port fails to fill the cell even when there are items in the system when you reload the world in some form of fashion.
To Reproduce

This case I was in a single player world and rejoined while the cell was filling up, when I rejoin it stopped filling.
Expected behavior

Of course I would expect the IO Port to continue filling the contents of its input buffer no matter what, given that it is connected to a proper system where the items are accessible.
Additional context

Environment

• Minecraft Version: 1.12.2
• AE2 Version: rv5-stable-11, rv6-stable-3
• Forge Version: 14.23.5.2772

IO Ports are incorrectly put to sleep when they could work on load and not the other way round.

There could still be some issues in relation to chunk loading in case the storage gets loaded after it has already ticked a few times. Which should not really be an issue in a chunkloaded area. If it is even an issue at all.