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It can be tricky to debug problems in Vue.js when dealing with scoped slots and data not updating. Scoped slots allow child components to pass data back up to their parent component, but it's easy to accidentally miss a step or make a common mistake that causes the data not to update.

Here are some steps you can take to fix this issue:

1. Check if the data is being passed correctly. Make sure that the data is being passed as an object and that all of the properties you want to access on the parent component are present in the data object. For example:

<parent-component>
  <child-component v-slot="data">
    {{ data.myData }}
  </child-component>
</parent-component>

2. Check if the child component is updating the data correctly. Make sure that the data you are updating in the child component actually exists and is being updated properly. for example:

data() {
  return {
    myData: 'some data'
  };
},
methods: {
  updateData(newData) {
    this.myData = newData;
  }
}

3. Make sure that you are using the correct syntax for updating the data in the child component. In Vue.js, you need to use this.$emit('input', newData); to update the data and make it available back to the parent component. For example:

methods: {
  updateData(newData) {
    this.myData = newData;
    this.$emit('input', this.myData);
  }
}

4. Check if you are using the correct syntax for the scoped slot in the parent component. Make sure that you are using the v-slot directive correctly and that you are referencing the data object with the data keyword. for example:

<child-component v-slot="{ myData }">
  {{ MyData }}
</child-component>

If you've followed these steps, but still have problems updating the scoped slot data in Vue.js, I recommend reaching out to the Vue.js community or posting your question on a forum like Stack Overflow for additional help.