Steps to reproduce:

1. Create a new project
2. Open Window > Animation > Animation
3. Open Window > Animation > Animator
4. Select any object in the hierarchy
5. Create an animation for the selected object
6. Create a new empty Animator state
7. Make transition from your created Animation clip state to the new Animator state
8. Select the transition marker (white line)
9. In the Inspector window try zooming in in the transition clip preview window

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Actual results: Animator state clip is flickering

Expected results: Animator state clip is not flickering

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Reproducible with versions: 
6000.0.66f1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a5

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Tested on (OS): 
MacOS Sequoia 15.7.3