[LPS-93823] hreflang variant <link> tags are removed from <head> in SPA scenario - Liferay Issues

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Branch Version/s:

7.1.x, 7.0.x
Backported to Branch:

Committed
Story Points:
0.25
Fix Priority:
3
Git Pull Request:
https://github.com/brianchandotcom/liferay-portal/pull/72097

Start portal
Ensure your browser cache is clear
Access the default site without auntenticating
Checkpoint 1: guest user views the Welcome page
Inspect the page (hit F12 to enable dev tools or just view page source)
Search for "hreflang" in the HTML
Checkpoint 2: you find many ocurrences of that <link> attribute, one per enabled language. These links point to alternate variations of this page for diferent languages, and look like this <link data-senna-track="temporary" href="http://localhost:8080/hr" hreflang="hr-HR" rel="alternate" />
Click on "Welcome" page in the navigation menu. Note this triggers an SPA interaction
Inspect the page again

Observed: hreflang links are gone

Expected: links are kept and updated to the new page

Additional tests:

Server is processing top_head.jsp and generating the response as in a regular (i.e. non-spa) request
The xhr request sent by browser receives a response which includes the hreflang links

It looks like that some browser side processing related to SPA is crafting a new <head> section where these links are not being included.

Tested in master at cc13adc1d8e74a1fd27947342fb047b1e87fc1f9