Objects with single letter name won't show up in hierarchy search results

Unity: Scene Hierarchy

2020.3.X

How to reproduce:
1. Download the attached project
2. Enter "1" in the search field of the Hierarchy window
3. Observe the Hierarchy window

Expected outcome: Object named "1" is displayed
Actual outcome: Object named "1" is not displayed

Reproducible with: 2020.3.46f1, 2021.3.21f1, 2022.2.11f1, 2023.1.0b8, 2023.2.0a6