The assigned Script icon is not showing in the Gizmos dropdown menu when the Script is named "Button" and is given an icon

How to reproduce:

1. Create a new project
2. Create a Script in the Assets folder with the name “Button“
3. Change the Scripts icon to any icon
4. Select the arrow near the Gizmos icon for a Dropdown menu
5. Observe the Dropdown menu

Expected result: The Script icon shows up in the Gizmos Dropdown menu
Actual result: The Script icon does not show up in the Gizmos Dropdown menu

Reproducible in: 2021.3.34f1, 2023.2.7f1, 2023.3.0b4
Could not test in: 2022.3.17f1 (the Script does not appear in the Gizmos Dropdown menu regardless of name), 2022.3.18f1 (endless “Hold on” dialog box upon icon assignation)

Reproduced on: Windows 11 Pro
Not reproduced on: No other environment tested

Notes:
-If the script is named “button“ it is no longer reproducible (has to be deleted and created again)
-In 2021.3.34f1 a blank (white) icon appears instead of the assigned one