I have hundreds of hours in the sim and as many saves. I have not seen one "tactical corruption." All detected forces are as when saved.
One thing that may be confusing some people is the map display is zoom dependant. Various contacts will only display at a particular zoom so zooming in or out may make them seem to disappear although they are still there.
Surface or submerged has had absolutely no impact on the quality or integrity of my saves or restores. I save equally in both states with no concern. I didn't have this problem in SH3 either.
-Pv-
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