Bambu Studio says invalid config

Bambu Studio shows a notification reading The 3mf file has invalid config, load geometry data only. The model arrives on the plate; the project settings behind it do not.

What makes the config invalid?

Two things have to be true together. The project names a printer that is not a Bambu Lab model, and its per-extruder settings do not have one entry for each nozzle the file declares. A multi-extruder OrcaSlicer or Creality Print project is the usual way to hit both.

Is my file broken?

No. It is a valid project for the slicer that wrote it, and that slicer will still open it. Bambu Studio is refusing a config it cannot line up with a printer it knows.

How do I get the settings in?

Convert the file to Bambu Studio and pick a Bambu Lab printer, or your own from My hardware. The settings are rebuilt from that printer's profile, so the per-extruder values match its nozzle count. Bambu Studio's PrintConfig.cpp is where those per-extruder keys are declared. See OrcaSlicer to Bambu Studio.

What about the other warning I get?

A PrusaSlicer file gets a different line, The 3mf is not from Bambu Lab, load geometry data only. Same outcome, same fix: convert it first.