Search Operator cannot be deleted using the keyboard

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the Search window (Window > Search > New window)
3. Press the "+" button to add a Query block
4. Select Operators and choose either "AND" or "OR"
5. Click on the operator in the search bar to select it
6. Press the "Delete" button on the keyboard

Actual results: Nothing happens

Expected results: The operator is deleted

Reproducible with versions: 6000.0.66f1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a5

Tested on (OS): MacOS Silicon Tahoe 26.2, Ubuntu 24.04

Notes:

• This works on other query blocks, except operators