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In the One step RT qPCR MasterMix RNA is transcribed into cDNA. dUTPs are incorporated into the cDNA during this process at 48 °C. Because UNG works optimal at 52 °C it will immediately destroy the newly transcribed cDNA. It is not possible to do the UNG reaction before the RT reaction, as the UNG is heat stabile and will not lose all it's activity after 10 minutes inactivation at 95 °C. Therefore the one step RT qPCR MasterMixes do not contain UNG. They do, however, contain dUTP to avoid contamination of future qPCR reactions.
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