asyncData called multiple times in nested routes

[msacar]

Version

v2.6.0

Reproduction link

https://codesandbox.io/embed/w04l29nmm7

Steps to reproduce

Hello im having problems with nested dynamic routes
here is a sandbox example https://codesandbox.io/embed/w04l29nmm7
i applied this documentation to sandbox https://nuxtjs.org/guide/routing#dynamic-nested-routes

pages/
--| _category/
-----| _subCategory/
--------| _id.vue
--------| index.vue
-----| _subCategory.vue
-----| index.vue
--| _category.vue
--| index.vue

for category route asyncData called 2 times
for category/subcategory route asyncData called 3 times

What is expected ?

asyncData called once for single page

What is actually happening?

asyncData called multiple times for single page

Additional comments?

for category route asyncData called 2 times
for category/subcategory route asyncData called 3 times

_{This bug report is available on Nuxt community (#c9000)}

[manniL]

Duplicate of #4008