Preview Button UI does not refresh after finishing Splash Screen Preview, remains to Cancel Preview.

Steps to repro:
1. Create a new HDRP project.
2. File > Build Settings > Player Settings.
3. Splash Image > Splash Screen > Click on Preview.

Actual Result:
UI does not refresh after finishing Splash Screen Preview

Expected Result:
Preview Button UI should be refreshed.

NOTE: Do not move the cursor.

Reproducible in:
2019.3.0a11, 2019.2.0f1, 2019.2.0a9.

Working Fine in:
2019.2.0a8.

Environment:
Windows & Mac.