I created a stackblitz demonstrating the problem: https://stackblitz.com/edit/wpoe2v
Notice when you initially open the dialog, the tabview ink bar is not displayed over the active tabpanel. it will only display once you proceed to click the inactive tabpanel.
if the tabview ink bar is changed to display: none and the $tabviewHeaderActiveBorderColor in changed to $primaryColor, the styling works much better
Compare the identical code but with Lara theme: https://stackblitz.com/edit/wpoe2v-brwcya