Execute existing function by Selenium-webdriver`executaeScript`method

Question

I am trying to run a function in the browser that is already set, but it is marked as undefined.

I ran the following code to reproduce the problem:

const webdriver = require("selenium-webdriver")
const driver = new webdriver.Builder().forBrowser("firefox").build()

driver.navigate().to("http://localhost/site")
driver.sleep(3000)

const code = `console.log(window.sayHello)`
const logCode = `console.log("${code}")`

driver.executeScript(logCode)
driver.executeScript(code)

When I tried to run the same code - console.log(window.sayHello) - directly in the browser still open, it returned the desired function, as in the image:

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EDITED

This seems to be a specific bug with the firefox driver as Chrome worked. I believe the variable window is being superscript, but I couldn’t rewrite it with the window original.