[Python] Selenium NoSuchElementError on Handelsregister.de after clicking "Normale Suche"

Title: Selenium NoSuchElementError in headless Firefox on handelsregister.de after clicking "Normale Suche"

Body: I'm using Selenium (Firefox in headless mode) to automate a document search on https://www.handelsregister.de/rp_web/welcome.xhtml.

The script loads the page and clicks "Normale Suche" successfully, but fails when trying to fill the form with the following error:

NoSuchElementError: Unable to locate element:
/html/body/div[1]/div[1]/div[2]/div/div[2]/div/div/div[2]/div/form/div[3]/div[2]/textarea


I confirmed the XPath is valid using browser dev tools. The same code works in non-headless mode.

What I tried:

• WebDriverWait for page and form
• Confirmed XPath manually
• Headless vs non-headless tests (works in visible mode only)

Expected behavior:** After clicking "Normale Suche", the input fields should appear and be fillable, but in headless mode Selenium fails to find them.

Code snippet:

driver.get("https://www.handelsregister.de/rp_web/welcome.xhtml")
wait.until(EC.presence_of_element_located((By.TAG_NAME, "body")))
driver.find_element(By.ID, "naviForm:normaleSucheLink").click()

wait.until(EC.presence_of_element_located((By.ID, "mainForm")))
driver.find_element(By.XPATH, "/html/body/div[1]/div[1]/div[2]/div/div[2]/div/div/div[2]/div/form/div[3]/div[2]/textarea").send_keys("WGO Grundstücks GmbH")

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