External preview and custom link processors result in faulty URLs

In an archetype project, install news from essentials, implement a custom link processor (I have attached one such implementation in the ticket) and enable the external channel preview.

When you navigate to a news detail page and you either click "Copy preview URL" from the page menu or directly click on the Preview button in the top right corner

Expected result: http://localhost:8080/site/news/the-medusa-news?preview-token=b6518f89-7f3b-4698-b838-d74eeda387b2

Actual result: http://localhost:8080/site/news/_any_?preview-token=b6518f89-7f3b-4698-b838-d74eeda387b2

When the custom link processor rewrites links from news/t/the-medusa-news to /news/the-medusa-news the External preview URL is populated correctly.

However, when the custom link processor rewrites from news/t/the-medusa-news to /the-medusa-news it is not.

In both cases, in the class org.hippoecm.hst.pagecomposer.jaxrs.util.HstConfigurationUtils and method #getPagePreviewUrl line 225 the returned String is always http://localhost:8080/site/news/_any_?preview-token=b6518f89-7f3b-4698-b838-d74eeda387b2

In the page service of the channel manager (community/channel-manager/frontend-ng/src/app/services/page.service.js) there is a method #getPagePreviewUrl that performs some logic of splitting and replacing

It looks like the logic in that method does not cover such edge cases as the one described above.