For some reason for armors (tanks and infantry fighting vehicles (armored personnel carriers)) in the configuration for collisions with Buildings, other Armors and Trees the sound was set to “default”
The game has sounds for this, good sounds, I see no reason not to use them instead of the same sounds for everything

btw this problem is only for armors, for cars, boats, etc. collisions sounds defined correctly

Here is an approximate amount of configuration work to make collision sounds "as designed"
e.g. mbt_01_base_f for buildung collision

1. change sounds paths
2. remove default sounds paths (2 pcs. to delete)
3. remove default sounds arrays (6 → 4 pcs.)

This work

needs to be done for 10 vehicle classes: