I have the same problem.
Any solution?
I couldn’t fix it, but I found an alternative by positioning the fab over the tab bar.
Add a custom class with sticky postion.
<div class="fab-container">
<ion-fab vertical="bottom" horizontal="end" slot="fixed">
<ion-fab-button (click)="goToTop()" color="secondary">
<ion-icon name="arrow-up"></ion-icon>
</ion-fab-button>
</ion-fab>
</div>
.fab-container{
top:80vh;
position: sticky;
z-index: 999999;
}
This is the result