Hiding NSFW content fails to hide threads on the "latest post" box below each subforum

I'm not sure if it happens every time when someone makes a post in a NSFW thread but I don't think it does. It seems to happen only rarely

Sorry I couldn't get a screenshot of it in time but this box here

showed me this post even though I have NSFW threads hidden

Edited:

Wait wtf it happened again for the same post?? This screenshot was taken after the previous one. Swissy's post is older than Erior's post but it reverted to it for some reason

Edited:

This is the post in the top screenshot if it helps for investigation. Erior posted 2 minutes later than Swissy