Over the weekend, many X users noticed that older Twitter images had mysteriously disappeared from the site. Now, the company has confirmed that an unspecified “bug” is responsible and it’s working on a fix.

The issue first cropped up Saturday, when older tweets that had originally included images began to show as un-clickable t.co URLs instead. X now says the bug affected “images from before 2014,” but as The Verge previously pointed out tweets from 2014 — including the iconic Oscars selfie from Ellen DeGeneres — were also at least temporarily affected.

The 2014 Oscars photo has since been restored but other older tweets still seem to have missing photos for now. “We fixed the bug, and the issue will be fully resolved in the coming days,” X said in a statement via its support account.