While working with React, you notice a function defined using the function keyword is not updating the component state as it should. You suspect it's related to the "this" keyword. What might be the problem?

In React, when using the function keyword to define a custom method within a component class, you need to manually bind the function to the component instance in the constructor using "this.functionName = this.functionName.bind(this);" to ensure that "this" refers to the component instance and not the function itself.