i'm using the latest fabric 1.16.5 version, and I'm finding that when I use /npc edit skin (username), the skins only show up if i've played with the username's account recently, is that supposed to happen?

Humm, no, it's not supposed to be like that. Singleplayer env? / Do you have valid internet connection?

i'm in singleplayer, and i did have a valid internet connection

i figured it all out! my school's internet apparently interfered with the skin grabbing stuff, but my home internet let it work :)