This happened (at least) once in the squawks release builder.

https://cros-goldeneye.corp.google.com/chromeos/healthmonitoring/buildDetails?buildbucketId=8924634500849736496

https://luci-logdog.appspot.com/logs/chromeos/buildbucket/cr-buildbucket.appspot.com/8924634500849736496/+/steps/PaygenBuildCanary/0/stdout


[1;31m06:27:04: ERROR: <class 'chromite.lib.cros_build_lib.RunCommandError'>: return code: 1; command: cros_sdk -- check_update_payload /tmp/tmppmKmnm/delta.bin --check --type delta --disabled_tests move-same-src-dst-block --part_names kernel root --dst_part_paths /tmp/tmppmKmnm/new_kernel.dat /tmp/tmppmKmnm/new_root.dat --metadata-size 0 --src_part_paths /tmp/tmppmKmnm/old_kernel.dat /tmp/tmppmKmnm/old_root.dat
Error: Unsupported minor version: 6

It's building fine now, so filing mostly to see if it happens again.