fix: qp-only transition during initial transition

[buschtoens]

Seems to fix https://github.com/emberjs/ember.js/issues/18577.

[jelhan]

Please see my comment here: https://github.com/emberjs/ember.js/issues/18577#issuecomment-719001736 Not sure if this is another bug or if this fix does not address the root cause.

[rwjblue]

This fix looks good conceptually, but we need to fixup the tests and add a specific test for the scenario described in https://github.com/emberjs/ember.js/issues/18577

[wagenet]

@buschtoens status?

[Mikek2252]

@buschtoens @rwjblue Is this solution still good? if so is there anything i can do to help get this merged? Happy to write the test for it if i can be pushed in the correct general direction, im not overly familiar with this code.