Tuplet note stems not visible with concert snare drum

When creating Tuplets (I tried with sextuplets and septuplets) the note stems don't show up. Looks like a bug.

Steps to recreate:
- New score, instrument concert snare drum
- Create a sextuplet or septuplet
- fill in the notes with either note head type
- The first stem is there but the others don't show, like a graphical glitch