I don't think so. As far as I'm aware, it's never come up before. The way it would play out, I think, would be something like...
Future president issues an EO or whatever rescinding the pardon. This doesn't really accomplish anything, though. It's really just a signal to the DoJ that the president proooobably wants them to pursue charges against the individual in question. Which they've probably already discussed directly.
DoJ brings charges against the individual.
The individual, files a motion for dismissal of charges, on the grounds of the prior pardon.
The judge hears arguments from the DoJ about why that pardon should be considered invalid, and rules one way or the other. If I had to guess, I'd say most judges would rule that the existing pardon can't be overturned, as it's a power defined explicitly in the Constitution, and overturning pardon's isn't.
Regardless of the ruling, the decision gets appealed and escalated through the appeals court system to work out the final outcome.
I don't think so. As far as I'm aware, it's never come up before. The way it would play out, I think, would be something like...