Onesignal script not fully loaded when subscribed and using many other js libraries

Problem/Motivation

Using the module together with a site that is using a lot of js(such as google tag, dfp, metrics, bigpipe, and so on), The bell and the prompt message is only loading on first visit, not when subscribing. Debugging is tedious, the only thing I could say is that the head script is attached as it should, but I see this message:

Anyway moving to the deferred flavour of onesignal, as it is recommended in onesignal custom code wizard, and changing:
https://cdn.onesignal.com/sdks/OneSignalSDK.js to https://cdn.onesignal.com/sdks/web/v16/OneSignalSDK.page.js

Solves the issue...