### Bug Description We, the Launchpad team, have a bunch of reactive charms that are built using Launchpad charm recipes. Since we did not pin the `charmcraft` channel to be used for the builds, they are now built with `charmcraft` 3.x. But the resulting charm files are missing many/all options from the layers included in the charm and are broken. Building the charm with `charmcraft` 2.x does produce a proper charm that has all the options present. ### To Reproduce https://api.charmhub.io/api/v1/charms/download/wf1A4OyHbIxzKmTWna89ZaDrH618Ft6p_517.charm is the `launchpad-appserver` charm built using `charmcraft` 3.x and that is broken. https://api.charmhub.io/api/v1/charms/download/wf1A4OyHbIxzKmTWna89ZaDrH618Ft6p_518.charm is the version that has the exact same charm code but built using `charmcraft` 2.x and it is not broken. ### Environment These charms are built on the Launchpad builders using charm recipes. But the issue is also reproducible with local charm builds on Ubuntu 24.04 with `charmcraft` 3.x, whereas `2.x` works okay. ### charmcraft.yaml ```shell # https://git.launchpad.net/launchpad/tree/charm/launchpad-appserver/charmcraft.yaml type: charm bases: - build-on: - name: ubuntu channel: "20.04" architectures: [amd64] run-on: - name: ubuntu channel: "20.04" architectures: [amd64] parts: charm-wheels: source: https://git.launchpad.net/~ubuntuone-hackers/ols-charm-deps/+git/wheels source-commit: "42c89d9c66dbe137139b047fd54aed49b66d1a5e" source-submodules: [] source-type: git plugin: dump organize: "*": charm-wheels/ prime: - "-charm-wheels" ols-layers: source: https://git.launchpad.net/ols-charm-deps source-commit: "9c59a9804f1f40e2a74be7dac9bf18a655a7864f" source-submodules: [] source-type: git plugin: dump organize: "*": layers/ stage: - layers prime: - "-layers" launchpad-layers: after: - ols-layers source: https://git.launchpad.net/launchpad-layers source-commit: "910dfb76754add5ed032a243c6081ee6a6b11256" source-submodules: [] source-type: git plugin: dump organize: apache-vhost-config: layers/interface/apache-vhost-config launchpad-base: layers/layer/launchpad-base launchpad-db: layers/layer/launchpad-db launchpad-payload: layers/layer/launchpad-payload stage: - layers prime: - "-layers" layer-coordinator: source: https://git.launchpad.net/layer-coordinator source-commit: "fa27fc93e0b08000963e83a6bfe49812d890dfcf" source-submodules: [] source-type: git plugin: dump organize: "*": layers/layer/coordinator/ stage: - layers prime: - "-layers" charm: after: - charm-wheels - launchpad-layers - layer-coordinator source: . plugin: reactive build-snaps: [charm] build-packages: [libpq-dev, python3-dev] build-environment: - CHARM_LAYERS_DIR: $CRAFT_STAGE/layers/layer - CHARM_INTERFACES_DIR: $CRAFT_STAGE/layers/interface - PIP_NO_INDEX: "true" - PIP_FIND_LINKS: $CRAFT_STAGE/charm-wheels reactive-charm-build-arguments: [--binary-wheels-from-source] ``` ### Relevant log output ```shell https://launchpadlibrarian.net/743876575/buildlog_charm_ubuntu_focal_amd64_launchpad-appserver_BUILDING.txt.gz has the build logs for the charmcraft 3.x build. https://launchpadlibrarian.net/743923593/buildlog_charm_ubuntu_focal_amd64_launchpad-appserver_BUILDING.txt.gz has the build logs for the charmcraft 2.x build. If needed, I can collect logs from a local build and share them too. ```