success page template file not called : M2

Question

After M2 upgrade success.phtml template file not called at order success page.

while onepage.phtml file is called at onepage checkout page.

Both file location is same but still success.phtml file not called:

app/design/frontend/Packg/themename/Magento_Checkout/templates

• success.phtml

• onepage.phtml

Note: I have also try to add/remove checkout_onepage_success.xml file in layout folder.