Just became a supporter to figure something out. Neocities doesn't support after-load connect-src from new free accounts, which means some widgets won't work (this is fairly new, I have an account that's a few months older than this one and doesn't have this issue). It's actually listed as a perk for supporters now: "Less Strict Content Security Policy."

I haven't found anything online about if it still works once you quit being a supporter, so that's this month's experiment! I'm not too hopefull but wish me luck