Generate outline toggle is inactive in the Sprite Editor when only one sprite is selected

How to reproduce:
1. Open the attached "2DET" project
2. Navigate to Tilemaps -> Ground -> Sprites
3. Select the "Spritesheet_Tiles_Ground" Asset and click "Open Sprite Editor" in the Inspector
4. In the left upper corner of the Sprite Editor select the "Custom Outline" tool
5. Select any sprite 
6. In an Outline Tool, try clicking the checkmark near the "Generate" button

Expected results: The checkmark can be pressed
Actual results: The checkmark can't be pressed

Reproducible with: 6000.0.10f1
Can't test with: 2021.3.40f1, 2022.3.36f1 (Feature was introduced in 6000.0.7f1)

Reproducible on: macOS Sonoma 14.5 (M1)
Not reproducible on: No other environment tested

Notes:

• Toggle can be pressed when no Sprite is selected
• Since the "Generate" button allows to regenerate an outline, it is not clear what is the usage of this toggle
• The description of the toggle specifies that you can use it with one Sprite