Drum palette: clicking on staff sometimes enters note in wrong voice
For drum notation (percussion), clicking the palette (single-clicking now) does not take into consideration the preferred voicing established in the [Edit Drumset] settings, though when using the keyboard to place notes in Note-Entry, it does work. This has nothing to do with the new 3.4 behavior, as it has been this way for a long time. In other words, MuseScore defaults to first-voice in a new measure while using the palette, regardless of alternative voicing settings.
It seems to me that the obviously desired behavior is to honor the settings of the drum editor, regardless of whether the user presses a palette item or types on the keyboard while in note entry.