Describe the bug
When using a slot to define the columns in the Wrapper Grid, the result in Vue 2 and Vue 3 is different.

• In Vue 2, if we pass 2 columns to the slot, only these two columns are rendered in the component.
• In Vue 3, no matter how many columns we pass to the slot, the component renders all columns, based on the data in the datasource

To Reproduce
Check the two examples below:

• Vue 2 - https://codesandbox.io/s/jovial-hamilton-k6hfl7?file=/src/App.vue
• Vue 3 - https://codesandbox.io/s/empty-smoke-cnyz0t?file=/src/App.vue

The two examples use the same implementation but the number of columns rendered in each Grid is different

Expected behavior
The two examples should work the same way as in the Vue 2 application.

Screenshots
Vue 2:

Vue 3: