Grinders Not working Small/Large grid

I’ve been testing the conveyor system with grinders in Space Engineers, and I keep running into a problem. In my setup, all grinders are correctly connected through conveyor tubes, conveyor junctions, and cargo containers. Everything is powered, it’s on a large grid, and all the ports are lined up exactly as they should be. Despite that, the vanilla grinders do not push items into the cargo system when I enable Automatic Push/Pull (which is the “Use conveyor system” option).

To rule out mistakes, I tested multiple configurations:

• Grinder → Conveyor Tube → Cargo Container
• Grinder → Conveyor Junction → Cargo Container
• Grinder → Conveyor Tube → Conveyor Junction → Cargo Container

In all cases the items just stay in the grinder’s inventory instead of being transferred automatically.

To make sure conveyors themselves weren’t broken, I tried a modded grinder (the Energy Blade Grinder). That one actually does push components directly into my cargo containers without any issue — which proves that the conveyor system itself is functional. But when I switch back to the original vanilla grinders, the items no longer transfer.

So far I’ve checked:

• Game is running in Survival, not Creative.
• Conveyor system is enabled in the world settings.
• Cargo containers are not full.
• There is power across the entire grid.
• Items can be moved manually between grinder and cargo when inventories are open.
• Automatic Push/Pull is enabled on all grinders.

In short: everything is connected properly, the system works with a modded grinder, but vanilla grinders refuse to push items into the conveyor system.

the one modded i used and worked is: https://steamcommunity.com/sharedfiles/filedetails/?id=2976903828

I hope some one has a clue what is going on.