If you can reliably reproduce this error in a small demo project, you need to submit a bug report.
Are these platforms dynamically spawned in runtime? If they are static, you can add NoSave behavior to them.
One workaround that comes to mind is to use temporary placeholder sprites in place of those platforms. Spawn the placeholders, save the game, then replace the placeholders with real platforms. And on loading the game - replace them with real platforms.