Hello,
After updating to 2.8.18, the game crashes silently on startup. I have this in the log: https://pastebin.com/kHGtTDwu
With 2.8.19, it's a bit different as I get a Java window for the crash: https://pastebin.com/iM2Cnzep

I know this is a bit of a mess with a lot of mods but I also have a crash on a minimal profile with only Fabric API, Moonlight (2.8.19) and Storage Labels: https://pastebin.com/CNZuFcCi
2.8.18 works with that profile, though.

Reverting to 2.8.17 works with both profiles.

I have the same problem

same problem. temp workaround (or maybe the problem is just this simple) is deleting the "SelfCustomItemRendererProvider", line in moonlight.mixins.json. im on my main menu now.

Fixed in 2.8.20 thanks to 20cfaaf