Framework7 Core: Router.allowPageChange did not set back to true after navigate between routable tabs when on async pages

[mmis1000]

• Framework7 version: 3.5.2
• Platform and Target: vue (but the bug is in core, so other platform may be affected as well)
• Live Link or JSFiddle: PREFERABLY (IF YOU WANT YOUR ISSUE TO BE RESOLVED ASAP). You can start from forking the following JSFiddle template: JSFiddle

Describe the bug

Router.allowPageChange did not set to true after navigate between routable tabs that on async pages.
It cause all links that are not navigate between tabs to be disabled
My route setup that cause issue: https://gist.github.com/mmis1000/cbc67269e77cc887b4eca50f1f6bd723
This bug may be the cause of #2573

To Reproduce

Steps to reproduce the behavior:

1. Add a page
2. Add a nested page with routable tabs, async componenet and a back button on the navbar
3. Enter from the master page to the page that has routable tabs
4. Navigate between tabs using tabbar of tabs
5. Click the back on navbar

Expected behavior

Router.allowPageChange is true and allow navigation to be happened
The page goes to master page

Actual Behavior

Router.allowPageChange is false and all navigation breaks.
The page keeps the same

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

Trying to set Router.allowPageChange to true from dev console make the route works again in my test.
But I don't know where is the proper position to set the Router.allowPageChange back to true in this case.

[nolimits4web]

Can you please setup a JSFiddle to illustrate the issue?

[mmis1000]

@nolimits4web
https://jsfiddle.net/aqdgw1se/2/
here you are
go about
go tab2
click back

And it should break