The pages are still in the wiki, but it seems some of them aren't suggested in the popup anymore? Initially I thought that the search was just being really slow and hanging until I searched for some other pages. I refreshed, cleared cookies and cache, and restarted the browser.
Execute a Shell Script, Macro Triggers, and Display Text are the ones I've found to be missing so far.
N.b. I was finding the new WYSIWYG editor to create a new topic really disorientating. I'm so glad I noticed the button to change it back to markdown.