The bazel-bootstrap package seems to build very slowly on these two architectures and is timing out on the buildds. I've tested in Docker locally and the build can take 5-7 hours, and there's one point where there is no screen output for a few hours (but the build continues normally after that).
Could you please increase the timeout value for this package on both of these architectures? 4 hours should be safe. I believe it will build correctly with that change.
Please let me know if you have any questions or need any additional information. Thanks!