Bad pom generation when trying to prepare release for a multimodule project with some timestamp snapshot dependencies even using the parameter -DallowTimestampedSnapshots=true

I have a Maven2 multi-module project with 3 modules. There is one with a time-stamp snapshot dependency and other two that both have the same snapshot repository.
I execute the following command: mvn release:prepare -DallowTimestampedSnapshots=true -DdryRun=true and everything seems to be fine, but when I have a look to the pom.xml.tag file, I see that the first module still maintains the time-stamp snapshot dependencies, but the plugin has elminated the time-stamp from the dependency in the other two modules. I reckon that this must be a bug, so maybe the DallowTimestampedSnapshots parameter works for the first dependency and then it is lost or ignored when generating the new pom file for the other two modules with time-stamp dependencies.

Cheers.