What does the error message "M119-Z axis is out of step when nozzle 2 is running" mean?

What does the origin return machine code "KM-ASSYM2-05" entail?

When this error occurs, how does it affect the
This error is related to the Z-axis being out of step during printing while Nozzle 2 is running. To resolve this, an origin return must be performed to reset the printer's coordinates and ensure smooth operation.