Gray square artefacts appears when deleting all characters in the Template window search bar

Steps to reproduce:

1. Create a new Unity project using a High Definition 3D Template
2. Go to Assets > Create > Visual Effects > Visual Effects Graph
3. Type in any characters into the search field
4. Delete all of the characters and press delete 1-2 more times
5. Observe the search field

Actual results: gray square artefacts appear

Expected results: no artefacts appear

Reproducible with versions: 6000.5.0a5

Can’t test with versions: 6000.0.66f1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a4 (search bar functionality does not exist)

Tested on (OS): Windows 11, macOS 26.2 (M1)

Notes:

• Reproduces with both Shader Graph and VFX Graph template windows