The selection box in the element is linked, if you can’t select it, it will be displayed if you select other

The reason is that the nesting is too deep to monitor!

The solution is simple

 @change="this.$forceUpdate()"

add this!

 That is, your selector can be forced to refresh every time it is selected

There is also a simple and crude method, that is, add a v-if to this form, and let it be false every time a change is triggered, and then true