Seems the changes include in a build do not include changes in the prior build(s) even if they are failed.

In this case, it would be better to accumulate change sets since the last successful builds and report all on the next successful build.

When the change sets associated with failed builds are not included in any successful build, the consumers of the build, which are usually only informed with the successful builds, will have a hard time to figure out which build has the change sets if they happen to be picked up by a failed build.