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Nikhil Sagar 
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Nikhil Sagar
You can take some steps to debug this behavior-
1. If you have a full copy sandbox try to run your code on the exact same record, this will help you in triaging the issue.
2. If the code is same please see if your code is dependent on some configuration like custom setting, custom metdata, labels, static resource. It is possible there are some differences for these configration between sandbox and production.
3. Please check the version of the classes, lwc and aura components. It is possible the components are on different versions in sandbox and production.
4. See which release is present in your sandbox and production , it is possible that they are on different releases which is causing some of your code to malfunction.
All Answers
You can take some steps to debug this behavior-
1. If you have a full copy sandbox try to run your code on the exact same record, this will help you in triaging the issue.
2. If the code is same please see if your code is dependent on some configuration like custom setting, custom metdata, labels, static resource. It is possible there are some differences for these configration between sandbox and production.
3. Please check the version of the classes, lwc and aura components. It is possible the components are on different versions in sandbox and production.
4. See which release is present in your sandbox and production , it is possible that they are on different releases which is causing some of your code to malfunction.