I didn’t know that this was the case.
“Wisconsin state law actually allows a person to change their mind and vote a new ballot if they have submitted an absentee ballot,” said Neil Albrecht, the executive director of the Milwaukee Election Commission.
Albrecht said election officials will destroy the original ballot, and voters are allowed to do that up to three times.
I wonder if there are any statistics about how often this usually happens. I would guess less than a dozen times per election.
If one has to do this, you should consider not voting at all.