Why the customer address is detected after I disabled the config "Enable Tracking Address by Google" in the backend?
Is this a bug?
If the config Enable Tracking Address by Google is enabled, customer addresses are cache so that next time customers reload the checkout page, their addresses will be filled up automatically. In this case, the address is cached by the Magento default function, not by our module.
Hence, when the config Enable Tracking Address by Google is disabled later, the address information still being filled up.
If customers edit this address, after reloading the checkout page, it will show the lastest address had been edited.
The conclusion that is Magento default behaviour but not a bug of the module One Step Checkout.
To make it clear, please have a look for reference: https://www.loom.com/share/02fdbed5b61c4b7d8aa338602308a915
If you need further assistance, please feel free to help.