Bug title: Pivot will display the content before the jump animation is loaded #10532
Description
Describe the bug
Pivot will display the content before the jump animation is loaded
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Pivot 会在跳转动画加载前显示出内容
Steps to reproduce the bug
Pivot.bug.mp4
Expected behavior
The Pivot content should not be displayed before loading animation
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Pivot 动画加载前不应该显示出内容
Screenshots
No response
NuGet package version
None
Windows version
No response
Additional context
No response