[Incorrect Data] No WPT results shown for 0% despite wpt.fyi showing results

https://webstatus.dev/?q=name%3A%22device+posture%22&num=100 shows:

Note the lack of results for Firefox or Safari.

Following the link to https://wpt.fyi/results/?label=master&label=stable&view=test&q=feature%3Adevice-posture%20%21is%3Atentative shows:

Notably, this has results for Firefox and Safari.

I expect these to be the same. Having no results is a very different situation to the test results being at 0%.