The summary written before publishing doesn't disappear from the textbox once the changes are published

Steps To Reproduce:
1. Create a new Project
2. Window > Services > Select an organisation to set up
3. File > Project Settings > Collaborate > On
4. Hierarchy > 3D Object > Cube > Save Scene
5. Collaborate > Changes > Write the summary and click on 'Publish'

Expected Result:
The summary disappears from the text box once it's published successfully

Observed Result:
The summary disappears from the text box once it's published successfully

Reproducible On: 2020.2.0a1, 2020.1.0a14, 2020.1.0a25
Package Version: 1.3.7

Not Reproducible On: 2020.1.0a13,
Package Version: 1.2.16

Note: Collab was broken from version 2020.1.0a14 - 2020.1.0a22
Fogbugz ID: https://fogbugz.unity3d.com/f/cases/1212232/

Environment: Win and Mac