Welp, guess I found out the hard way that my email app doesn't support the little reply box in emails. I'm so sorry; I just assumed you got wrapped up with irl stuff and hadn't had time to get back to me when all along I hadn't gotten back to you.
They do indeed need the ethnicity: mixed tag, but I've actually just now finished adding all my backlogged sets to the community. I left a comment on each one that's missing a tag, including the two I'd posted that you were referring to here, to let you know what the missing tag is. Hopefully that makes it easier on you and not harder!
And again, so sorry that I ended up accidentally going ghost on you. :(