How to reproduce:
1. Open the attached Project "Test Search All Open Hotkey"
2. On the keyboard press Ctrl/Command+K
3. In the Search Bar type "test cube"
4. Use the arrow keys to select "Test Cube.prefab"
5. Press Alt/Option+Enter

Expected result: The Prefab is opened
Actual result: The Prefab is selected

Reproducible with: 2023.1.0a15, 2023.1.20f1, 2023.2.0b18, 2023.3.0a14
Not reproducible with: 2021.3.32f1, 2022.3.13f1, 2023.1.0a14

Reproduced on:
- MacOS (13.5.2, Intel) Editor
- Windows 10 Editor

Notes:
- Instead of the additional action, the default action is performed, as if just Enter has been pressed