Can't seem to get a filter to spoiler new-ish pics

Wellwater
Magnificent Metadata Maniac - #1 Assistant
My Little Pony - 1992 Edition
Wallet After Summer Sale -

Just a flurry of H₂O
I’m trying to tune one of my filters so it will spoiler (or eventually just hide) pictures that are less than say 12 hours old that also haven’t reached a modestly high score threshold, under the theory that enough interest or enough time tends to sort out tagging so my other filters are more likely to be correctly applied if needed.
 
Unfortunately, it seems to break in weird ways. created_at.gt:12 hours ago && score.lt:25 shows the very latest 0-score uploads happily, but then opening them in a new tab shows no picture (i.e., blank) instead of a spoiler. Taking that out shows the picture as expected. Switching to just created_at.gt:12 hours ago moves the blank pictures to the image list (and they’re still blank if opened).
 
Since the search syntax page still doesn’t mention relative timestamps at all, I’m running mostly off guesswork and e.g. https://derpibooru.org/meta/feature-suggestions-and-discussion/post/3538937#post_3538937
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