see YT video, or:

1. go to Eden, any world, any soldier with HE hand grenade
2. spawn
3. throw grenade near you, wait explosion

Result → no debris sounds as defined in the config (Explosion_Debris_SoundSet)

This applies not only to grenade explosions, almost all explosions in the game (judging by the configuration - 53 pcs. of explosions config-classes) should reproduce Explosion_Debris_SoundSet sounds. But this does not happen due to a strange value in the volumeFactor parameter

In general, the game has 4 sets of explosion debris sounds

1. Rock_Debris_SoundSet
2. UXO_Debris_SoundSet
3. ClusterBomb_Debris_SoundSet
4. Explosion_Debris_SoundSet

but only the last one does not work and has a strange parameter. Take a look at they config values!