Continuum release does not work well with Maven2 and Perforce SCM provider (files are locked so release prepare fails)

Although stated that this is fixed in 1.1alpha2 (Continuum-1270) I still have this issue with the 1.1-beta-1 release.

[INFO] Updating local copy against the scm...
[INFO] Verifying that there are no local modifications...
[INFO] Checking dependencies and plugins for snapshots ...
[ERROR] org.apache.maven.shared.release.ReleaseExecutionException: Error writing POM: C:\TEMP\working-directory-beta1\1\pom.xml (Access is denied)
at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.writePom(AbstractRewritePomsPhase.java:678)
at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.writePom(AbstractRewritePomsPhase.java:623)
at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.transformProject(AbstractRewritePomsPhase.java:193)
at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.transform(AbstractRewritePomsPhase.java:116)
at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.execute(AbstractRewritePomsPhase.java:99)
at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:194)
at org.apache.maven.shared.release.DefaultReleaseManager.prepareWithResult(DefaultReleaseManager.java:107)
at org.apache.maven.continuum.release.executors.PrepareReleaseTaskExecutor.execute(PrepareReleaseTaskExecutor.java:43)
at org.apache.maven.continuum.release.executors.AbstractReleaseTaskExecutor.executeTask(AbstractReleaseTaskExecutor.java:67)
at org.codehaus.plexus.taskqueue.execution.ThreadedTaskQueueExecutor$ExecutorRunnable$1.run(ThreadedTaskQueueExecutor.java:116)
at edu.emory.mathcs.backport.java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
at edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(FutureTask.java:176)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.io.FileNotFoundException: C:\TEMP\working-directory-beta1\1\pom.xml (Access is denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at java.io.FileWriter.<init>(FileWriter.java:73)
at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.writePom(AbstractRewritePomsPhase.java:659)
... 14 more

Manually patching the scm-perforce-provider implementation as suggested in Continuum-1270 and bundling it with Continuum seems to fix the problem.