feature:check-visibility search doesn't find the mapped test

[foolip]

There seems to be something wrong with the feature: search functionality in the case of feature:check-visibility. In WPT, one test is mapped to this feature:

https://github.com/web-platform-tests/wpt/blob/11ee78cd478f37250bf54810add2149b6490764c/css/cssom-view/WEB_FEATURES.yml#L2-L4

That test can be seen here:

https://wpt.fyi/results/css/cssom-view?label=master&label=experimental&aligned

However, adding feature:check-visibility to the search, nothing is listed:

https://wpt.fyi/results/css/cssom-view?label=master&label=experimental&aligned&q=feature%3Acheck-visibility

[foolip]

This doesn't seem to affect all features with just a single test. Here's one that works:
https://wpt.fyi/results/?label=master&label=experimental&aligned&q=feature%3Aaria-attribute-reflection

[foolip]

I have found two more cases that don't work:

https://wpt.fyi/results/?label=master&label=experimental&aligned&q=feature%3Aspeech-synthesis
https://wpt.fyi/results/?label=master&label=experimental&aligned&q=feature%3Awebrtc-sctp