Currently, the JATO pods fire at around 120km/h as expected, but the rocket entity detaches from the pod as soon as they fire, causing a small explosion when they hit the runway which jolts the aircraft, usually knocking off some of the ordinance attached to the pylons.
I made a recording of it here:
https://odysee.com/@The_Oligopolist:9/MiG-21_JATO:1
The only mod I am using is the Echo-19 sound mod. Can anyone else confirm this behavior?
Not sure if this is documented so I thought I should make a post about it.