The build you linked to has an error message at the top of the page:
Your
build has exceeded the memory limit of 4G on 1 container. The results
of this build are likely invalid. We have taken a snapshot of the memory
usage at the time, which you can find in a build artifact named
`memory-usage.txt`. The RSS column in this file shows the amount of
memory used by each process, measured in kilobytes.
Please check out this doc on how to troubleshoot memory issues.