Pianoleo, what do you mean with “same voice”? I did not change anything regarding voices, just described the most minimal steps to reproduce…
(Just trying to find out if you are adding to the bug report or telling me that I’ve done something stupid )
Your drum kit is one voice, as I can see from the stems. Let’s put this another way:
You’re using one voice (you are!)
You decide you want a note that lasts for two thirds of the second beat.
If Dorico doesn’t work the way it currently works, how would you type in that you wanted a quarter/crotchet under a quaver/eighth triplet? E.g. two thirds of the beat?
Forget about this being a drum kit, because it’s irrelevant - a regular five-line instrument stave would work exactly the same way.
You type a C quarter, then three C triplet eighths, then two C quarters.
Then you add an F to the first C quarter, then hit 7 to make it a half note.
What happens? It ties together a quarter and two (tuplet) eighths.
What would you do in this situation if you wanted a half note F? You’d make it another voice, of course!
Why would you expect a drum kit to work any differently to this? You have the option to use multiple voices, and it’s what you’d do if it were a violin stave. (We’ll call it divisi violins to circumvent the fact that one violinist couldn’t play this.)
There’s a neat option that you might find useful when dealing with different durations in drum set: Notation Options > Percussion > “Truncate to shortest duration”.