After some digging it looks like the social login Cordova plugin overrides the deeplink URL scheme which results in that all mobile deeplinks stops working.

I've created a GitHub issue for it, not sure if this is the right way to go: https://github.com/OutSystems/cordova-outsystems-sociallogins/issues/42

The problem seem to be this line, iOSCopyPreferences.js:105, instead of appending the deeplink_url_scheme variable value to the existing array, it sets it to a new array. This results in that the existing deeplinks URL scheme (value set in App Identifier under Module / Distribute / Native Platform / iOS) is replaced, rendering all deeplinks formatted like this 'app.identifier://ModuleName/Screen' invalid.