TYPO3 Core

That's strange to me, because I use too the Flux/Vhs/Fluidpages/Fluidcontent ecosystem (with the exception of fluidcontent_core) and I don't remember I've had problems :S

My first thoughts:

1. what does

<f:for each="{menu}" as="menuPage">
<f:link.page pageUid="1">Page link</f:link.page>
</f:for>

mean? That you repeat a link to the page with id=1 for every item in {menu}? It doesn't seem correct IMHO

2. Did you set config.baseURL? Are there other configurations like config.typolinkCheckRootline or config.typolinkEnableLinksAcrossDomains ?

This is a test code for to show where he works and where not work.

This code: <f:link.page pageUid="1">Page link</f:link.page>
Output: <a href="http://www.domain.ltd/index.php?id=1">Page link</a>

... then I'm install ext: RealURL version 1.12.8

This code: <f:link.page pageUid="1">Page link</f:link.page>
Output: Page link

This code:
<f:for each="{menu}" as="menuPage">
<f:link.page pageUid="1">Page link</f:link.page>
</f:for>
Output: <a href="http://www.domain.ltd/page-link">Page link</a>

The code you wrote is the same you gave in the ticket description; my question was why did you wrote:

<f:for each="{menu}" as="menuPage">
<f:link.page pageUid="1">Page link</f:link.page>
</f:for>

which seems totally wrong to me: indeed, the output

<a href="http://www.domain.ltd/page-link">Page link</a>

Does not seems to have sense, unless your page with id=1 has "page link" as title.

I think that your code should be something like:

<f:for each="{menu}" as="menuPage">
<f:link.page pageUid="{menuPage.uid}">Page link</f:link.page>
</f:for>

Said that, my first suggestion is to check the realurl configuration file. could you add it to this ticket?