Just updated Jenkins to latest LTS release and updated S3 plugin to 0.6. All S3 uploads fail with this error message in the console log:

ERROR: Publisher hudson.plugins.s3.S3BucketPublisher aborted due to exception
java.lang.StringIndexOutOfBoundsException: String index out of range: -25
at java.lang.String.substring(String.java:1937)
at java.lang.String.substring(String.java:1904)
at hudson.plugins.s3.S3Profile.upload(S3Profile.java:123)
at hudson.plugins.s3.S3BucketPublisher.perform(S3BucketPublisher.java:174)
at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:32)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:804)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:776)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:725)
at hudson.model.Run.execute(Run.java:1709)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)