The problem with choosing a branch when one of the children is disabled

[DimmNet]

Hi @riophae ,

I discovered a problem that can be seen here:
https://codepen.io/DimmNet/pen/xyVaBq

If you choose the branch "aa" or his child "aaa", everything works correctly.
But if you select the branch "a", then the branch "a" is completely in the v-model, despite the fact that the "aab" is disabled.

What needs to be done so that when choosing a branch "a" only available elements get into the v-model? In this case, it is "aaa".

[DimmNet]

Here is how I solved this problem:
https://codepen.io/DimmNet/pen/BqWGWq