SearchKit: URLs to external sites no longer render

SearchKit displays that used to link to an external site now link to an invalid internal URL. This is a 5.44 regression.

(Simplest) Steps to Replicate

Create a new SearchKit search on Website entities. (Screenshot 1347)
Create a new display, linking the website to itself. (Screenshot 1348).
Click Preview.

Expected Result

Link of "https://www.example.org" links to "https://www.example.org".

Actual Result

Link of "https://www.example.org" links to "http://dmaster.localhost/https://www.example.org".

git bisect points to PR #21820, specifically commit ID 8fd58f5640.

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