Questions with ignored tags are hidden even if the "gray out" option is selected

This appears to be a problem on the main site only (I couldn't repro here or on Meta Stack Exchange).

Steps to reproduce:

1. Find a popular tag that has some questions displayed on the homepage.
2. Add that tag to your ignored tags and make sure the "gray out" option is selected.
3. Reload the page.

Once the tag is added to the ignored tags, relevant questions will be grayed out normally¹ but once the page is reloaded, they will all be gone.

Here's a demo:

Note: this happens only with the new design of questions lists (e.g., the homepage). They're displayed as usual on the /questions (which hasn't received the new design yet):

¹_{Well, not exactly normally. They used to be displayed in lower opacity but I have a separate post about that.}