KeyNotFoundException is thrown in the console when editor mode is changed from release to debug with an element is added in the Dependencies list of SceneTemplateAsset preset, refer attached video.

Steps to repro:
1. Create a New Project
2. Project > Scene Template.
3. Select Scene Template and create Preset.
4. Select Scene Template Preset > Dependencies > Add to List (+).
5. Select Mode > Switch to Release mode > Switch to debug mode

Actual Result:
KeyNotFoundException error thrown in the console

Expected Result:
No error in the console

Reproducible on:
2020.2.0a15

Note:
Scene Template feature introduced in 2020.2.0a15

Environment:
Windows 10 & Mac 10.15.