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This test was trying to assert that we didn't do a reparse by comparing the green nodes of the two trees. We didn't hold onto the root of the old tree, so it was possible for the root to fall away if we were testing recoverable trees. If the root had fallen away, it meant that asking for the old root would recover it as well, which would result in deserializing the roots twice and the green nodes being different.
The fix is to ensure the root doesn't fall away.