Yes, whenever a topic with votes is closed or archived, users get their votes back.
Everyone can check their votes in their user profile (Activity > Votes)
https://bitwish.top/my/activity/votes
@pier in your case, your 10 votes are being used in open requests. It is true that Piano roll: improve selection interactivity appears in your list of votes and it shouldn’t, but that is an 11th topic. You still have 10 valid votes that you can reassign as you wish.
I’m going to investigate what happened with that closed topic.