Bar repeats don't show in percussion grid?

I have a percussion kit that is displaying as single-line instruments in the part, and grid in the score.

I’m using bar repeats to simplify the part, but they do not display in the full score.

Am I right in assuming that bar repeats cannot show in the full score unless I display those instruments as single-line?

Because the grid is effectively another completely separate staff, you will find that you have to add the bar repeat region to the grid itself. However, we didn’t really intend bar repeat regions (or indeed slash regions) to be used on percussion grids, so you might find the positioning a bit peculiar.