ok, for some time I was not really sure if it was a bug or what (although it is quite consistent in my DT, but I have never read it in any formal or informal manual) but I think we could take advantage of this:
press and hold one trig [1-8], +press and hold [FUNC], then release the trig first. This makes the trig latch, which also means that, for short samples without loop play mode+infinite decay, it can work as a way to mute it (also for the sequencer) until I press it again.
It is only not working like that with one single waveforms, because you hear it all the time without having to press the button… maybe still interesting for someone.
I also accidentally did this and then I didn’t know why they were not triggering, even if all volume levels and mutes were high and on… made me crazy in the beginning because there is not a visual feedback of it.