### Bug Description When a part with `organize` contains in the a mapping like `{"app": "app/app"} and the source "app" is a directory, the source is not organized to the desired directory. In other organize cases, like `{"app": "app2/app"}`, it works correctly as expected. Related to: https://github.com/canonical/rockcraft/issues/892 Looks related to this line: https://github.com/canonical/craft-parts/blob/b654a77fd4e41ddc8d520bda039e5c38560fc42c/craft_parts/executor/organize.py#L85 ### To Reproduce Using this `rorkcraft.yaml` file: ``` name: example base: ubuntu@24.04 version: '0.1' summary: Summary description: | Description platforms: amd64: parts: simpla-part: plugin: dump source: . organize: app: app/app stage: - app/app ``` and commands: ``` mkdir app touch app/file.txt ``` `rockcraft pack` fails with (when executing the `stage`, as `app/app` does not exist): ``` ubuntu@worklaptop:~/example$ rockcraft pack /root/parts/simpla-part/install/app: No such file or directory Detailed information: FileNotFoundError: filename: '/root/parts/simpla-part/install/app' ``` I would expect the correct output structure is generated in this case. ### part yaml ```shell fastapi-framework/install-app: plugin: dump source: . organize: app: app/app stage: - app/app ``` ### Relevant log output ```shell - ```