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Calling set_recipe() on an assembling machine LuaEntity, then writing (a non-zero value) to crafting_progress to it, causes the next craft to always be common quality, regardless of the recipe's actual quality. It's only for one craft, and the next one is always correct.

I've attached a scenario I made that demonstrates this: Screenshots:

Thanks for the report. I remember changing this behavior some time ago for 2.1, so it is already fixed for 2.1. By force starting the recipe by write to crafting_progress there is a shortcut that was not rolling result quality and as such this product was always of normal quality. You can workaround this issue by writing recipe's quality to https://lua-api.factorio.com/2.0.77/cla ... lt_quality after the crafting_progress was set. In 2.1 this workaround will not be needed because there will be a quality roll happening when crafting is force started this way even if no real ingredients were consumed.

Awesome, and thanks for that workaround!