I have not seen any direct loss of depth with discrimination, since Sovs use audio discrimination and only turn off the target audio when a target is to be rejected. The threshold will still give you an ID, as will the meter if used.
However, at times you will see what appears to be loss of depth because a target that is weak enough will often hit a little too low and can fall into the rejected region. Targets that are partly masked or averaged with another object can hit low and fall into a rejected area....you would never bother to check them out because you can't hear that they don't sound right.
This really shows up with air tests...A silver quarter can read lower than a nickle in air at the right distance.
All signals are still processed and identified as to the conductivity determined by the processor no matter if the audio is signalled to turn off or not.
The detectors that use phase discriminator chips will lose depth, and also not process targets that are rejected....you will never know that they are there.
HH