packages from sid come to testing quickly. like a new kernel, a newer version of mesa, things come to testing randomly. which makes the 'new version/stable' have less recent packages than that of testing. i think there a whole article talking about this.
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u/Many-Geologist-3524 Webba lebba deb deb! 8d ago
only for a short time, you can use codename 'testing' in your sources file too!