Latin-Character-Sets VS fontbakery

Christoph Koeberlin's Latin S (this is what I recommend, as it tries to improve on the other sets by taking a more equitable approach to Latin support that isn't narrowly focused on Europe)

The best way to test a typeface is to try it out yourself. The only stress tests that really make sense to apply to any typeface are the ones you would find in QA tools that typeface designers use, like Font Bakery.

I'm afraid there's not much you can do about it. Some of these variable weight fonts are built with overlapping vectors. If you feel like falling down a rabbit hole of how and why, you can start here: https://github.com/googlefonts/fontbakery/issues/2999 but given it looks like yer trying to put something together before NYE, you might just wanna find a different typeface.

just to hop on to this, the tool FontBakery automatically checks your fonts for glyph support as well as a variety of other technical checks. I use it in my font production and it's honestly invaluable.