According to the documentation in the project settings
Auto-cancel redundant builds
With the exception of your default branch, we will automatically cancel any queued or running builds on a branch when a newer build is triggered on that same branch. Scheduled workflows and re-runs are not auto-canceled.
However, CircleCI is currently canceling builds on our default branch (
Does CircleCI have a separate setting for the default branch or did something go wrong when syncing the default branch from GitHub?
We have pipelines enabled. Our CircleCI config when that build was canceled: https://github.com/mui-org/material-ui/blob/5440c77d668de773192978ec6f60609848d39a8c/.circleci/config.yml