I believe this is also preventing IPv6 only servers from being stood up.

Unless IPv6 only is not supported. In which case, never mind.

Here is my log if it's useful.
Feb 13 04:06:24 i-099497c2ff08f05a9 start.sh[4734]: 4.478 Verbose Scenario.cpp:368: Map setup finished: 2.807500 seconds.
Feb 13 04 ...

Nearly 2 weeks of trying to fix this issue, and it was solely because I didn't understand lua behaviour.

I greatly appreciate your kind and well-put-together response.

TL;DR
Assemblers should be able to output missing ingredients
What?
Please add another option to Assemblers that outputs missing ingredients, this could be calculated as max(0, (recipe_ingredients * automated_insertion_limit) - assembler_input)
Why?
Allowing Assemblers to output missing ...

I've spent some time looking over the documentation, the forum and running commands but I can't seem to work out the quality of an assembly machine's recipe.

I'm aware result_quality will tell me the expected quality of a resource being created, but it feels like .get_recipe() is missing .quality ...