Somehow this sentence in bold is nonsense, as you might see in Simulation examples for KiCad/Eeschema/ngspice or Simulation examples for KiCad8/KiCad9/Eeschema/ngspice .
I have taken your example test_002.tar.gz. You have forced me to re-attach all models, as the paths have been incompatible. I have done this by
Double Click on symbol to open ‘Symbol Properties’ window → Simulation model → Spice model from file → select file → OK -->OK.
This has to be done for each symbol (device) with model attached.
Then select tran ‘Edit analysis tab’ and set time step not to 10u but 10n, and run the simulation, with a result like your plot above (with better time step resolution).
So what might be your problem right now? I cannot reproduce it.