"System.IndexOutOfRangeException" and "ArgumentException" errors are thrown when activating and deactivating multiple sprites in an animation

How to reproduce:
1. Open the attached “Skinning Bug Project”
2. Open the “SampleScene” scene
3. Open the Animation window (Window → Animation → Animation)
4. Select the “Boss-Bouncer” GameObject
5. Play the “Boss 2 Active” Animation
6. Observe the Console

Actual result: Two types of errors are thrown while the animation is playing
Expected result: No errors are thrown

Reproducible with: 13.0.1 (6000.3.0a4), 13.0.2 (6000.3.3f1), 14.0.2 (6000.4.0b3, 6000.5.0a4)
Not reproducible with: 10.2.2 (6000.0.65f1), 13.0.0 (6000.3.0a4)

Reproducible on: MacOS Sequoia 15.7.2 (M1 Max)
Not reproducible on: No other environments tested

Notes:

• Error 1: “System.IndexOutOfRangeException: Index -1 is out of range of '36' Length.”
• Error 2: “ArgumentException: Key: -36098 is not present.”