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Java 19 definitely doesn't work with mixin. It is not supported. Don't know what your problem is with java 17 since you don't post the debug.log using that.

Same as above but for the horseinboat mod.

Issue with the tep mod, probably conflicting with another mod? Check you have the latest version then contact the mod author.

rei plugin compatibilities is a mod for roughly enough items that pretends to be jei to other mods. You can't use it with the real jei mod.

You can define a server resource pack in the server.properties. See Default Resource Packs here: https://minecraft.fandom.com/wiki/Resource_Pack This is downloaded "out-of-band" from the specified url I don't think sending images directly from the server to the client is a good idea. * It is outside the normal lifecycle of resource loading * Doing so with custom login network packet(s) is going to slow down the login and potentially break the 30 second timeout for people with slow machines/networks If you do want to do it, one way is to look at how skins and capes are handled in SkinManager. But in general having a client make a random network connection is a bad idea, a potential security hole and a privacy issue. When I see this kind of thing happening in modpacks, e.g. trying to connect to discord or the like, I generally just uninstall the mod or the whole mod pack.