Windows have no flashing

In a 20 year old house how common is it to find windows were not properly flashed? The Tyvek is simply cut out around the windows. It isn't even taped to the window frames.
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On Sunday, August 5, 2018 at 4:25:24 PM UTC-5, Davej wrote:

Sounds like a DIY person did not know what they were doing.
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