I'm getting the following error when trying to load my save:

__beacon-interface__/control.lua:63: {
  allowed_module_categories = {
    ["beacon-interface--module-category"] = true,
    mupgrade = true
  },
  history = {
    changed = {
      "QualityAssurance",
      "CopyPasteModules",
      "machine-upgrades",
      "PlanetsLib"
    },
    created = "beacon-interface"
  }
}
stack traceback:
    [C]: in function 'assert'
    __beacon-interface__/control.lua:63: in main chunk

I see there have been some very recent changes to this mod, so I manually downgraded to the previous version and my save loaded just fine. Hope that helps track the issue down, but let me know if you need anything else. Thanks!

Thanks for the report. It tripped an assertion. I’ll look into this. Please downgrade mupgrades until I can resolve it.

Fixed in Mupgrades v0.69.19