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Yes, it is a known issue. This issue was in PS5 SP5.5 as well. Please refer release notes of PD5.0 SP6. It talks about this issue.
I created a KB article for the workaround of this issue. In KB article I mentioned that it will be fixed in SP6. But we could not do that. It will be fixed permanently in PD51 which will be released in Q1 of 2010.
Please refer KB article available at following link: