How to reproduce:
1. Open the attached TowerDefense.zip project
2. Select any .png file in the Assets-> Sprites folder
3. Go to the Inspector window-> Texture Type-> Set it to Default and press Apply
4. And then set Texture Type back to Sprite (2D an UI)

Actual: Applying Import Settings to .jpg file throws an error:
EndLayoutGroup: BeginLayoutGroup must be called first.
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:187)

Reproducible with: 2019.2.0a6, 2019.2.7f1, 2019.3.0b5, 2020.1.0a5

Note: see the video attached in the Edit section