Obtained during another 99R attempt. This attempt finished, but I was unaware of the timing rules for the 99R category being different (requiring entering the Wario cutscene rather than splitting on round clear) and as such wasted 57 seconds not exiting the level. To avoid confusion, I will not personally submit this as a 99R PB and only submit this for the 20R PB obtained within it. I'll leave it to you mods if you want to manually enter it as a 99R time for the leaderboard or not; the full run is in this highlight.
Regarding the run itself, I feel like I just got lucky. I knew this was going to PB when I entered 20, but I feel like I could've gained more time than I did. Gonna work on 50R more now that I've accomplished my goal of completing a full 99R run in one life before trying that again.