How would anybody know? They aren't supposed to vote at all!.......................
I just looked up some studies that had been done in the wake of the Bush/Gore fiasco. One said it would have changed the outcome, and the other said it would not have.
As we learned in the case of the fake pipe bomb guy with the MAGA van, felons do vote in Florida, and for both parties.
There is no mechanism in place to prevent a felon from registering to vote, actually voting, and then having their vote counted. Did you have to submit to a police background check to vote? I didn't.
The threat of prosecution (which rarely happens) has been the only deterrent standing in the way of felons voting in Florida, or anywhere else.