Google Lighthouse Thinks Cloudflare Bot Fight Mode is Deprecated

Google Lighthouse is giving me the following error under "Best Practices:"

window.webkitStorageInfo is deprecated. Please use navigator.webkitTemporaryStorage or navigator.webkitPersistentStorage instead.

The source file is called invisiblejs. It doesn't take much legwork to find out that this is related to Cloudflare's Bot Fight Mode setting. What I haven't been able to figure out is what to do about this. Is this a false positive on Google's part? Is there something I need to update? Is Cloudflare running deprecated code?