If you look at Special:NewPagesFeed on enwiki, the oldest unreviewed articles are https://en.wikipedia.org/wiki/.44_Remington_Centerfire and https://en.wikipedia.org/wiki/.223_Wylde. The reason that they are unreviewed is that the curation toolbar does not appear on those articles, consistently, with no way to trigger it.
PageCuration, having been built by those evil liberal Californians Fox tells me about, is clearly mimicking it's creators by clamping down on our god-given right to effectively discuss and purchase firearms. An alternate explanation might be "it looks like Page Curation bugs out when it sees articles that start with a full stop", but that's clearly nonsense.
(seriously, though. Full stops make Page Curation sad. And that makes me sad. Can someone fix this?)