Fixes "Failed to persist session" error on iOS #3655
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Fixes #3653
Ideally we'd be able to reproduce this in a unit test to prevent a regression.
Regardless, it looks like there might be a timing issue where sometimes the writer tries to do something with the file after
File.Dispose()has been called. I've moved the writer inside the try block to ensurewriter.Dispose()is called beforefile.Dispose(), which should avoid the problem.