I have a base inside the Church in Mogalevka, there is a break in the wall in the back of the church (when exiting the back door of the building the break in the wall is to the left), there are two bushes just inside the wall at that break where I have repeatedly placed a landmine and have been able to reproduce an issue where stepping on the landmine results in only knocking a player out, not killing the player.

If we cut the bushes down and then step on the mine this will result in killing the player.

It appears as if the bushes are absorbing the majority of the damage output from the landmine.

(I have not tested this in another location however have seen this same behavior when a landmine clips into another object which has identical results - the player is knocked out for a short time with zero bleed and zero damage).