There might be. There's no way of knowing at this point.
I imagine that if this feature is accepted into the core, then you won't lose anything. Although it's entirely possible that there might not be a migration path, so you might lose the existing sprint data.
I cannot imagine why any scenario would lose you any data on issues. I suspect the only exception might be for sprint data. I could see a problem if you have some parallel sprints and the process can't handle it, it may simply pick the latest open sprint and close the rest, or even delete thm.
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