Factorio Forums

What did you do?
I placed an epic Biolab and marked it for upgrade to Legendary quality. While the lab was not upgraded yet I placed module replacement requests from prod2 to prod3 modules. (see the demo save file for a setup)

What happened?
The bots do not deliver the new modules until the lab has been upgraded, or the building upgrade is cancelled by overwriting it with the same quality again, even when the new modules are available.

What did you expect to happen instead? It might be obvious to you, but do it anyway!
I would expect the modules to upgrade independently of the building upgrade and not to be staggered behind it.

Does it happen always, once, or sometimes?
Always

Thanks for the report. I added this behavior to fix an issue with module requests disappearing if the upgraded entity had a higher number of module slots. However, it seems to work correctly now, so I reverted the change. Fixed for the next release.