In 3D editor mode, textures do not generate Sprite subassets when imported as Sprite

Steps to reproduce:

1. Open 3D project or switch Behaviour Mode to 3D in Project Settings > Editor
2. Add texture/image to Assets
3. In Inspector, switch Texture Type from Default to Sprite
4. Observe no Sprite subasset generated

Note: In 2D editor mode, Sprite subasset is generated even when Sprite Mode is Multiple by default

Actual results: 

Expected results: 

Reproducible with versions: 6000.6.0a5

Not reproducible with versions: 2022.3.65f1

Can’t test with versions: 

Tested on (OS): Win 11

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