@eromancer: I was mostly thinking how I've not seen many Yuri doujin parody works in awhile. Also I've unfortunately seen at least a couple of hetero doujins for Super Star myself, which aren't my cup of tea and I don't seek them out, I sometimes see what's new and popular out there for series I follow just to see what's getting made.
I think though Yuri Doujins aren't as common as fanart, and in terms of Super Star getting maybe less hetero doujins than usual I think it's mostly due to other series taking priority with that crowd. I imagine Chainsaw Man is probably getting the majority of focus there this year. Combined also with the issues that have come from Covid, conventions getting cancelled, I remember hearing someone mention that Japan had a lot of specialty printing shops close down, and other issues from the pandemic unfortunately.
So I still think it's less of a problem with Super Star, and more of the doujin landscape, at least currently. As I've seen a good amount of people that have a lot of love for Super Star, and a good amount of ship art for it. Just unfortunately doujin works are scarce for it, at least for now. I'm at least hopeful that we'll see more Yuri doujins for Super Star in the future.