No, that's fine for a 'normal' instrument like Bass. it's just that drum synths don't generally respond to Note Off messages; the samples are triggered and played in their entirety regardless of when the Note Off arrives, commonly known as 'one-shot'. So for drums, there's no point in having longer durations than needed to be able to easily see and edit notes in the PRV. It wouldn't usually cause any problem to have longer durations, but when there is a problem like this, you want to eliminate anything that looks unusual.
 
What plugin was causing this?
 
 
 
 

Understood, thank you!
It was ozone vintage tape demo trial. Once trial has ended such behavior has occurred

That's a good one for future reference. But odd that it wasn't causing other tracks to drop out as well if it was on the Master bus...?

brundlefly
That's a good one for future reference. But odd that it wasn't causing other tracks to drop out as well if it was on the Master bus...?

Pardon me, just rechecked the project. Plugin was placed on Drum master Buss.
Maybe it's related only to my specific PC with my specific plugins set.

I had this problem and when I transposed the midi by an Ocatve all was ok.

fitzj
I had this problem and when I transposed the midi by an Ocatve all was ok.

That would make sense for a Bass part where the synth tuning is transposed to help accommodate shorter controller keyboards and low MIDI notes fall outside the instrument range, but if it were a transposition problem in this case, he'd be hearing the wrong kit pieces play on notes that weren't dropped.
 
It sounds like the unlicensed plugin on the Drum bus was the culprit. Makes more sense now.