Did you give it enough time to start? My model does start after ~2.38sec. 

I tested with KiCAD 7.0.8

Simulator, Sim Command, Transient tab, 1m in Time step and Final time set to 3 seconds.  

[![enter image description here][1]][1]

 
Please see attached picture:

[![enter image description here][2]][2]  

Later, the plot looks  like this:  

[![enter image description here][3]][3]


  [1]: https://i.sstatic.net/zuRiO.png
  [2]: https://i.sstatic.net/eLC1z.png
  [3]: https://i.sstatic.net/o95Ky.png