multiProjectOptimisation breaks builds on multi-project projects

[BluCobalt]

Setting multiProjectOptimisation causes builds to not include classes in artifacts if you build with :build from the root project. Either disabling multiProjectOptimisation or running :subproject:build directly builds normally without any problems.

[NebelNidas]

I suppose your subprojects are using different MC versions? In that case, breakage is expected. Although Loom should probably catch that beforehand and print an error message

[c0nstexpr]

I've encountered the same problem in my project. The build task gives erros related to the following code https://github.com/FabricMC/fabric-loom/blob/cfe72b933a35778fbac05628f7a5111b9219c6e0/src/main/java/net/fabricmc/loom/util/service/SharedServiceManager.java#L54

[c0nstexpr]

I've encountered the same problem in my project. The build task gives erros related to the following code

https://github.com/FabricMC/fabric-loom/blob/cfe72b933a35778fbac05628f7a5111b9219c6e0/src/main/java/net/fabricmc/loom/util/service/SharedServiceManager.java#L54

I switch back gradle jdk version to 17 and it build successfully. It's weird