Broken object physics

I made my first mod, a new pants texture. everything seems to be ok, but the problem is that their physics is broken. what to do with this? how to fix? Explain clearly for a noob in Unity

what unity version are you using?
I feel like the box collider got corrupt in a sense because of an old unity version.
The current unity version is Unity 2021.3.29f1

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i use 2022.3.36f1 version

downgrade to 2021.3.29f1

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i will try this