I am using Facebook comments plugin on my website. When I check Lighthouse report, it says that "Page prevented back/forward cache restoration. The page has an unload handler in a sub frame" and gives the following URL as a culprit:

https://www.facebook.com/plugins/feedback.php?app_id=XXXXXXXXXXXXXX&channel=https%3A%2F%2Fstaticxx.facebook.com%2Fx%2Fconnect%2Fxd_arbiter%2F%3Fversion%3D46%23cb%3Df638418aaad172353%26domain%3...

So what can be done to disable using the unload event?