'API data from provider seems to get lost during Navigation

I am a beginner level Flutter developer trying to resolve the issue with the Navigation stack. In the existing app:

When user logs in to the app, login api call is shooted
Homescreen is rendered with Navigator.popUntill method
All the APIs in the providers get shooted and the respective tabs/screens get filled with api data.

Now, I want to include Onboarding screens before Homescreen, so I made below changes:

Navigator.push method used to include Onboarding screens.
After onboarding screens are over, user clicks on "To app" button
On click of "To app" button, the login call is made again
User is redirected to Homescreen with Navigator.popUntill method.

But now the data from providers is lost as the respective screens do not show any data. I am pretty sure that something is going wrong with the Navigation stack when I use Navigator.push method to add Onboarding screens but I do not have much expertise in Flutter to debug the issue. Need help with restoring the provider data when navigating to Onboarding screens.

Solution 1:^[1]

I think that the cause isn't in a navigation stack. Probably you placed Provider widget lower than navigation (MaterialApp). Try something like that or show your code for better understanding.

Provider(
  create: (context) => ClassThatCallsAPI(),
  child: MaterialApp(
    // Navigator placed here and any route will
    // get the same data from provider
    // and also can put some

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Solution	Source
Solution 1	Sergey Lobanov

'API data from provider seems to get lost during Navigation

Solution 1:[1]

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Solution 1:^[1]