I have created one up-stem and one down-stem voice. The down-stem voice is the changed into a down stem slash voice using Voices → Rhythmic slashes → Slashes with stem
Then Dorico crashes when adding notes after this in the up-stem voice and change voices: Voices → Change Voice → Down-stem Slash Voice 1
BTW, when selecting a passage to change the the notes to rhythmic slashes all notes on that staff changes. Is this how it’s intended to work?
Isn’t it possible to just move the selected notes to the slash voice?
Well, when this bug is fixed it’ll be an easy task to move notes from and to the slash voice…
Yes, that’s my conclusion too after some testing around. Then I’ll have to wait for the next update since moving a voice to a slash voice causes Dorico to crash.