"AssetDatabase.FindAssets" can't find Assets of one type when the second type is the same word with a different capitalization

How to reproduce:
1. Open the user-attached project “Bug AssetDatabase.Find type name case”
2. In the upper toolbar, open the “Find” menu
3. Click “Thing (lowercase)” and then “Thing (uppercase)”
4. Observe the Console

Expected result: There are two messages about 1 Asset found in both cases
Actual result: The Asset is found only in the first case

Reproducible with: 2021.3.34f1, 2022.3.17f1, 2023.2.4f1, 2023.3.0b1

Reproducible on: Windows 11 Pro, Windows 10 (user reported)
Not reproducible on: No other environment tested

Note: In 2021.3.34f1 the Asset is found in the second case and not the first