I've seen this behavior even with cross-platform apps. The problem
is that the Finder checks to see whether the app is runnable before
the copy has completed, so the app looks corrupted from the
Finder's perspective.
The workaround is to copy the app with a temporary name for the
bundle (e.g. prefix a dot, to hide it), then rename it when the
copy completes (e.g. remove the prefixed dot). That gives the
Finder a hint to re-check it.
I think it does this to newly-downloaded applications that haven't
been run before.
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