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
rocket-loader.min.js:1

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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