The extension is installed as of Special:Version. By browsing the extension's git history, seems it was removed from desktop beta features by dbb73c389d73aef805d7b52f980922106d9d8bcf (see T146436 and T160076 too; commit authored by @Jdlrobson). Hence removing Wikimedia-Site-requests (extension is enabled, nothing for us here) and Regression (the behaviour seems to be intended from some reasons).
From our end it's just a config change but the process will need to be followed:
Specifically a link to discussion about enabling the feature. :)