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While assembler works on some simple item, you can change its recipe to some complex item, and then assembly machine creates that new item even though it received resources for different item. Create rocket defense for the price of red science pack.

Thank you for the report, it will get fixed in 0.6.1.
When you change the recipe of the assembling machine, or mine it when it is doing something, the progress is reset (and ingredients paid for the product are lost).

Annoyingly this is still the only way to produce rocket defenses in an Assembler. If you try to do this normally the inserters stop working when there is a full stack in the assembler`s input slot.

Yes, it doesn't make sense to produce it in a normal assembler. Should be switched of there, behause it confuses...

Edit: Add check when item is selected for production

Sooner or later this will be rebalanced and will use some expensive ingredients (like modules or so) but in numbers that fit into the stack.