scrollBehavior is not what I expected

[Kevin Wisoky]

Versions

• nuxt: v2.15.8
• node: v14.18.1

Reproduction

scrollBehavior is not what I expected, here is the codesanbox link

Additional Details

I created app/router.scrollBehavior.js file to define a custom behavior

Steps to reproduce

1. open the pages/index.vue, scroll it down, the picture below is an example:
   
2. click item, it will enter pages/product/_id.vue, the picture below is an example:
   
3. click browser's back button, back to pages/index.vue.

What is Expected?

1. from pages/index.vue to pages/product/_id.vue, I don't expect it scroll to top in pages/index.vue at first;
2. from pages/product/_id.vue back to pages/index.vue, I expect it scroll to savedPosition.

What is actually happening?

1. from pages/index.vue to pages/product/_id.vue, it scroll to top in pages/index.vue at first;
2. from pages/product/_id.vue back to pages/index.vue, it scroll to top.
3. the gif below is an example:

[stale]

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