The ethers.js nonce manager doesn't appear to be up to the task of preventing this [flickering test](https://circleci.com/gh/magmo/force-move-games/203?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link). I've opened [an issue](https://github.com/ethers-io/ethers.js/issues/363) on ethers.js, but there doesn't seem to be any update on it.