I'm having some issues with classes not being packaged into the aar output of my project with submodules. I have a submodule import with

commonMain {
            dependencies {
                implementation project(':common-mp')

Within this project, is an expected class and actual definition for android. When I assemble outputs using mainModuleassemble, the jar within the aar does not contain the source files from the common-mp project. I've tried 'api' instead of 'implementation', but that doesn't work. Am I missing something obvious?