Files get converted to sprites without hitting apply after refocusing unity.

Steps to repro:
1. Create a new project.
2. Drag any .jpg/.png/.psd file into the Project view of the project
3. In the Import Settings switch Texture Type from Default to Sprite.
4. Focus to other application.
5. Refocus unity.

Actual Result:
Files get converted to sprites without hitting apply after refocusing unity.

Expected Result:
Files are in the same format.

Environment:
Windows and Mac

Occurring with:
2019.3.0a3, 2019.3.0a1

Working fine:
2019.2.0b3