There are no stupid questions, only stupid answers.
Honestly I'd doubt that, since mavpole is less consistent than normal FPG setup, so the only time someone would actually do that is 8-1 or some shenanigans in 1-1/4-1. Therefore, I don't think so, at least not in the past year or two.
In any%: It could theoretically happen, I remember seeing taven go for 1-1 mavpole after a slow underground. That could have saved the optimal rule and allow WR. Taven has also done pl8-1 in a run, after which could have completed 8-2 through 8-4 if he didn't let mario die. There have been chances but only a handful of people even go for FPG in runs and I don't remember anyone getting a mavpole in a PB run. It's possible that it has been done in a run that was completed but had a death or massive slowdown somewhere.
If you mean any category, some mavpoles have been done in beat 5-4 recently. (minus world -1 full fpg is also a mavpole as it's a FPG without setup but I don't know if that's what you mean. If so, it has been done in a lot of runs and is quite consistent)
I mean, my 5:07 PB has a FPG when I really didn't know what I was doing, so it was kind of like a mavpole. Though, getting a true mavpole in a PB run is very unlikely, though, not impossible.
Jumping at the bottom of the flagpole and hoping you get good subpixels to clip in
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