Rests hidden in score but not in part

EDIT: For anyone who stumbles on this: since posting two weeks ago, I learned a far-better work-around for creating empty bars with chord symbols: create a bar repeat region, set the “Custom scale” property to 1%, and set the Count Frequency at least one bar longer than your blank-bar region (to hide the numbers).

Result: the bar repeats will be hidden, leaving the bars empty, but retaining their width.

Original post:

I want to hide some rests.

I understand that to do this, they must be implicit rests, and I must select “ends voice” for the last note preceding the rests I want to hide.

I also understand that explicit rests can be turned into implicit rests by selecting them and hitting “delete”.

I’ve done this, and in the score, all the rests I want hidden are hidden.

However, in the part, some are hidden and some are visible.

I’ve tried multiple times deleting the explicit rests in the part, but it just doesn’t work.

See the attached screen shots, which show the same bars in the score and part (except the score starts one bar earlier).

What to do?

Dorico 3.5
Big Sur 11.5.1