In Magento 2.4.3, you may get an error in the console when checking out with Google reCAPTCHA when not enabled. https://github.com/magento/magento2/issues/33741
To fix this issue, enable Google reCAPTCHA for checkout in Magento. Go to Stores > Configuration > Security > Google reCAPTCHA Storefront > Storefront. Set Enable for Checkout/Placing Order to Yes. Google reCAPTCHA requires a pair of API keys to enable this feature. Instructions on how to do that are found here: https://docs.magento.com/user-guide/stores/security-google-recaptcha.html
If you do not wish to enable Google reCAPTCHA for checkout, you can disable it in Magento. Run the following command:
bin/magento mo:dis Magento_ReCaptchaCheckout -c
You will also need to recompile.