Factorio Forums

1. Load attached minimal mod for reproduction. It merely prints out the name of the research in any on_research_reversed and on_research_finished events and adds a simple research chain.
2. Start a new game and go into editor mode.
3. Force research 'technology-name.out-of-order 5' by shift clicking on the "Start research" button for 'out-of-order 5' in the tech tree. Note that the prerequisite researches are completed in order (1, 2, 3, 4, 5)
4. Un-research 'technology-name.out-of-order 1' by clicking on the "Un-research" button for 'out-of-order 1' in the tech tree. Note that the events come in the wrong order (2,3,4,5,1)

I expected the researches to be un-researched in order (5, 4, 3, 2, 1).

Thanks for the report however the un-research logic in the map editor doesn't guarantee any specific order that the technologies will be un-researched in. Since technology effects are all independent un-researching any given one in any order should not matter.