When Tile palette is in Edit mode and Tiles are selected using selection tools then the selected tile area appears twice, refer the attached video

Steps to repro:
1. Create a new project with 2D Template
2. Window > 2D > Tile Palette
3. Create a new Palette
4. Paint tiles using a sprite
5. Click on "Edit"
6. Select multiple tiles using "Selection tool (S)"

Actual Result:
Selection box appears twice on selecting multiple tiles

Expected Result:
Only single instance of "Selection Box" appears on selecting multiple tiles

Note: Unable to check in Unity 2020.1.0a13 to 2020.1.0a7 because of this issue (https://fogbugz.unity3d.com/f/cases/1194001/)

Reproducible in:
2020.1.0a17, 2020.1.0a14

Working fine in:
2020.1.0a7, 2019.3.0f3

Environment:
Windows 10 & macOS 10.14