Rocket Loader Unload Event

We have noticed that when we run Chrome’s LightHouse page speed analyzer, we see the following error in the Best Practices section :
The unload event does not fire reliably and listening for it can prevent browser optimizations like the Back-Forward Cache. Consider using the pagehide or visibilitychange events instead

We want to keep the rocket loader on, as we think it does help with page speed. But just curious why it would be throwing this up in lighthouse?

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