Ionic 6 - Modal ion-nav navigation transition not good

Hello everyone,

I have implemented the ion-nav on modal base on this article How to Navigate in Ionic Modals with ion-nav - Ionic Blog

The problem is when I have ion-button in footer the button overlaps for a second.

here is the sample app:
here is the code: Modal with Navigation - StackBlitz
is there a way to prevent it or should I report this as bug?

Thank you all for your time