Playground fails to load (404) via 'API' page

[actionshrimp]

I just tried to visit the playground by (from the homepage):

1. clicking 'api' in the top right
2. then clicking 'playground' in the bottom right (the 'next page' button, as playground is the page after API).

and got a 404.

This link seems to be missing target="_self" like the others - I did try to hunt down the place to change it, but as it seems to be automatically built from here I was a bit at a loss as to why target="_self" wasn't being picked up by vitepress in all locations.