Water is injected over a specific boost threshold, right? Mine is set at 14psi for example.
The dump valve only vents when the throttle is closed SHUT, so there is no boost then. Whatever mist was on the way to the cylinders has long gone when the DV vents (or recirculates)
Traces of water mist off-boost wouldn't hurt anyway, to damage the engine you'd need large quantities under vacuum so you can get waterlock for example.
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