What is the reason for the event listener not reacting when I assign the key with a value from props?

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There could be a few reasons why the event listener is not reacting when assigning the key with a value from props:

1. The key value from props may not be a valid event listener. For example, if you assign a string value to the key instead of a function, the event listener will not work.

2. The function being assigned to the key may not be properly bound to the component. Make sure that the function is being bound to the correct "this" keyword.

3. There could be an issue with the props being passed down to the component. Make sure that the props are being passed down correctly and that the value for the key is not undefined.

4. There could be conflicts with other event listeners or components on the page. Check for any potential conflicts or overlapping event listeners that may be causing the issue.