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Yarn installation may fail during a Docker build because the necessary dependencies and packages may not be installed before executing the yarn command. However, when executed in a container, the necessary dependencies and packages are already installed, which allows for the successful installation of yarn. Additionally, the configuration and environment variables may be different between the build and container execution, which can also impact the success of yarn installation. It is recommended to check the Dockerfile and ensure that all necessary dependencies and packages are installed before executing the yarn command during a Docker build.