So, I feel like this is probably wasted effort and it'll get fixed by SE in the next day or 2 anyway. That said, since they updated last night without correcting it and it's only a 5 minute fix, I threw together a dat with the storage slip data corrected. Place it in:
ROM/217/21.DAT
https://www.dropbox.com/scl/fi/bjx22blgwjeumu0wii8d3/21.DAT?rlkey=5ce0q59ffdly2vk9eow9lkn8v&dl=0
Recommend replacing the real dat, not pivot, so it doesn't get stuck there when SE gets around to changing it again.