They’re still there in the HTML and at first glance at least one is a sensible looking JSON object but do not appear under the “All” tab, are not findable by search or keywords.
One of them is just a single bulleted list.
It’s rather worrying and I’m still investigating.
UPDATE: Appears to be only when viewed on my 2010 MacBook Pro and its outdated Safari.
If your wiki has an “all tab” … this seems likely to be a wiki originally developed in TW Classic? If so, I wonder whether there’s any formatting or other complications for whom backward-compatibility is beginning to fail?