Simulator continues to run after playing back a .fit file

I'm using real world data files to test a data field.   In this, case, I'm testing with a 300km file.

It takes 18 hours to run this file, so simulation is pretty painful.  I extract console logs and analyze the results.

What I'm seeing it that the simulator continues to run after the end of my data file.  Whats worse, it appears to switch from playing back the .fit file to generating data.