Texture preview icons are missing in Frame Debugger when expanding "Textures" foldout

Steps to reproduce:

1. Create a new project using Universal 3D template
2. Open the Frame Debugger (Window > Analysis > Frame Debugger) and Enable it
3. Select any event that has "Textures" foldout populated (e.g. Draw Procedural)
4. Expand the "Textures" foldout
5. Observe the "_BlitTexture" property

Actual results: No icon is visible to the left of the “_BlitTexture” property name (sometimes it shows up for a second when navigating through events)

Expected results: An icon with a preview is visible to the left of the “_BlitTexture” property name

Reproducible with versions: 6000.0.68f1, 6000.3.4f1, 6000.3.10f1, 6000.4.0b9, 6000.5.0a7

Not reproducible with versions: 6000.3.3f1

Tested on (OS): Ubuntu 24.04, macOS 26.2

Notes:

• Reproduces with most textures (except "_UserLut")