Drum Palette is not updating after editing

Do the following:

1. Create a new score
2. Select 5 line Drumset from Percussion section of Instrument Palette then click finish
3. Right click the created drum staff and open Drum editor
4. Edit Note 81 to read Triangle and select note style, staff position etc
5. Click on Apply
6. Click on OK
7. Select first rest crotchet time value and click N to engage note entry
8. Open Drum Pallette

You will find the triangle has not been added to the Drum Palette!

The workaround seems to be save the score, shut down MuseScore and reopen it.

You can also create another stave select it and on clicking N to enter notes the Drum Palette wil clear
On reselecting the drumset staff the Drum Palette will have refreshed.

Would be far better if the Drum Palette refreshed automatically.