Undo functionality does not work when resetting Unity.Searcher.EditorSamples in Searcher Samples

Steps to Repro:

1. Create a new Project
2. Import Package Manager > In Project > Searcher > Samples > Searchers Samples
3. Click on Assets > Samples > Searchers Samples > Unity.Searcher.EditorSamples > Inspector > Reset
4. Click on Ctrl/Cmd + Z

Expected Result: Previous values should be set back

Actual Result: Undo functionality does not work

Reproducible on: 2021.1.0a2, 2021.1.0a1

Note:
1. Searcher Package is not available before 2021.1.0a1
2. On Resetting 'SearcherExampleComponent' could not be found error is thrown (It should not be deleted from the list as it is the default value)

Environment: Windows and Mac