Mods mismatch detected!
IndustrialRevolution3: Mod contents are different even though the versions are the same. The most common cause of this is improper mod setting usage (conditionally requiring files based on mod settings) on the client or server but not the other. This can also be caused by modifying mod files on the client or server but not the other.
IndustrialRevolution3LoadersStacking: Mod contents are different even though the versions are the same. The most common cause of this is improper mod setting usage (conditionally requiring files based on mod settings) on the client or server but not the other. This can also be caused by modifying mod files on the client or server but not the other.
IndustrialRevolution3SpaceMining: Mod contents are different even though the versions are the same. The most common cause of this is improper mod setting usage (conditionally requiring files based on mod settings) on the client or server but not the other. This can also be caused by modifying mod files on the client or server but not the other.
Although I'm on Linux and the other player is on Windows, we tried copying the entirety of each other's mod files, instead of locally repacking the mod, but we still get this issue; in both cases, it's specifically these three mods causing the issue. Have other players run into this MP error? I have a MacBook, and a separate Linux machine; I can try setting up a MP game between my machines at home, or figure out if the patching script can be made to be reproducible (as of now, each platform uses a different ZIP compressor, adds timestamps to the output file, …).
UPDATE: false alarm; while testing the unpacker I left an unzipped version of the mod in my mods directory, and Factorio was using that older version instead; please disregard.