Doesn't seem to work in experimental. Ctrl or shift clicking an item doesn't move it into red slots.

Are you in multiplayer? I'm starting to think that experimental broke the mod for some reason.

Both, it doesn't work in solo or multiplayer for me.

It should work solo, I've never heard of it breaking in that way. Are there any other mods that could be interfering with that action?

Multiplayer not working is caused by an engine bug that is hopefully getting fixed next experimental version without any other issues, so we'll have to wait and see on that.