Package Manager window text missing when the project is upgraded

Reproducible steps

1.make any unity project in an older version e.g. 18.2
2.close the project and open in a newer version either - 19.3.0a11 or 19.3.0a12
3.open the package manger window by going "window" - "package manager"

OR

1. start a unity project in 19.3.0a11 or 19.3.0a12
2. go into - "edit" - "project settings" - "editor" - change the "assets pipeline mode" from 2 to 1
3. restart the project
4. open the package manager

Actual Result:
The text is missing and so are the buttons, but the drop down arrows remain.

Expected Result:
The text and buttons to show on the window.

Reproducible in:
2019.3.0a12, 2019.3.0a11.

Environment:
Tested on Windows

Note:
The package manger has to be be dockable with another window (two windows in the same area where you cant have both open for your layout)