Middleware(s) sometimes not executing on double browser back navigation

[jsonpoindexter]

Version

v2.10.2

Reproduction link

https://github.com/jsonpoindexter/nuxt-middleware-test

Steps to reproduce

1. Navigate to http://localhost:3000/a
2. Use "Go to page B' nuxt-link to navigate to http://localhost:3000/b
3. On http://localhost:3000/b either use Go To External link to navigate to an external link, or navigate directly to an external link via the browser
4. From the external site: press the browsers Back button twice

What is expected ?

User should land on /a and the anonymous middleware for page a should execute and display:"[a] ANON MIDDLEWARE" in the console

Pressing back button two times in quick succession:

Pressing back button once to get back to page B, and then once again after page B has loaded:

What is actually happening?

If the second browser click back was executed while page B was loading the middleware for page A will not execute.

Additional comments?

I seem to only be able to reproduce this issue on slower machines. On faster machines it is near impossible for me to execute the second browser back click while page B is loading.

As stated above I am also only able to reproduce this (on slower machines) if the second browser Back button is executed before page B's mounted life cycle can run.

[jsonpoindexter]

It looks like what is happening is that the server side code is executed for the first navigation back to the app (page B) and then the client side code is being executed on the second page navigation back to the app (page A) thus skipping middleware execution for page A since:

In universal mode, middlewares will be called server-side once (on the first request to the Nuxt app or when page refreshes) and client-side when navigating to further routes.

https://nuxtjs.org/guide/routing#middleware