Doesn't even get to the mojang logo, crashes instantly, sends the user back to the mc launcher. I know the 1.19.4 version is still in beta, but this really needs to get fixed.
error code -1

I also have this issue with using either l3 or l4 versions of optifine for 1.19.4

Have you tried downgrading your Fabric API? See #1053 for details.

Have you tried downgrading your Fabric API? See #1053 for details.

Yeah, I just tried, and it fixed the issue. Still, they should fix the incompatability with the latest fabric api version, due to the incompatability of other mobs with 0.80.0