Play button is disabled in a second Animation window after pausing and disabling Preview in the first Animation window

Steps to reproduce:

1. Create a new 3D URP project
2. Create an empty GameObject in the Hierarchy
3. Open two Animator windows and dock them in the Editor so both are visible
4. From the Hierarchy, select the empty GameObject
5. Click Create in the Animation window and save the new animation
6. In the Animation window, click Add Property > Transform > Position
7. Add new keyframes anywhere by double clicking in the timeline
8. In one of the Animation windows, click the Play button and click it again to pause
9. In the same window, click the "Preview" button to disable scene view mode
10. Try to Play the animation in the second Animation window

Actual results: Play button is disabled/greyed out in the other Animation window

Expected results: Play button is clickable in the other Animation window

Reproducible with versions: 6000.5.0a7, 6000.5.1f1, 6000.6.0a7

Not reproducible with versions: 6000.4.12f1, 6000.5.0a6

Tested on (OS): macOS 26.5, Ubuntu 24.04

Notes:

• On some earlier versions, after 9th step, both Animation windows would not play until refresh, but in latest versions it seems that only the play button is disabled
• "Space" shortcut still works to play the animation
• Adding new keyframes or entering Play mode, makes the button accessible again