Check your modules requirejs-config.js. Probably there is mapping like
"Magento_Checkout/js/view/billing-address": "Vendor_ModuleName/js/view/billing-address",
Then later Requirejs try to load all files that have Magento_Checkout/js/view/billing-address from module where this file doesn't exists.
One option is to add to requirejs-config.js of the module extra line (instead of copying the list.js file to this module)
"Magento_Checkout/js/view/billing-address/list": "Magento_Checkout/js/view/billing-address/list",
Ideally module should use mixins to modify billing-address.js to avoid this kind of issue