Vanilla Assemblers steal queue from modded assemblers even though they cant make the item.
When you enable co-op mode on Vanilla Assemblers, they steal the build queue from modded assemblers that don't share blueprints with them.
The items essentially get de-queued and never made - so in game if you queue 100 things on your modded assemblers you actually end up with ~40.
This is easy enough to test: -
- Make a modded assembler entry in the SBC files.
- Make some modded blueprints in their own modded blueprint category and assign it to your custom assembler only.
Put down 3 Vanilla assemblers, enable co-op mode on two of them. Queue up your modded items in your modded assembler and you will see the build queue decrease but the items never appear queued anywhere else.