[4.0.0-beta.18] Tabs slot="top" not working

[amitairos]

Bug Report

Ionic version:
4.0.0-beta.18

Current behavior:
Tab bar with slot="top" is displayed in bottom of screen.

Expected behavior:
Needs to be displayed at the top

Steps to reproduce:
See code

Related code:

    <ion-tab-bar slot="top" color="primary">

Other information:

Ionic info:

insert the output from ionic info here

[ionitron-bot]

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