ProxyGhost

If you can reproduce it on native Windows 11 as well, that pretty much rules Wine out. Since it’s happening with both a HeartGold and Black save, this sounds more like a regression in the current PKHeX build than something save-specific. It might be useful to test the same saves with the previous release and see if SetUpdateDex works there. If the older build updates the dex normally, that would make for a pretty clean bug report with an easy before/after comparison.

I’d definitely be interested in something like this. Mystery Dungeon has enough lore and weird little details that theory discussions could easily support their own ongoing community. I’d probably start with a regular forum thread first and see how much activity it gets. If you end up with the same group of people coming back regularly and several different theory topics going at once, then a club would probably make more sense. Either way, having one place to collect theories instead of them being scattered across random videos and comment sections would be really useful.