Block and Chunk information in F3 debug screen shows differently than in previous versions. For example, the Chunk information shows the MCA file name, e.g. [in r.-1.-1.mca].
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But it's mentioned in slicedlime's video.
Slicedlime's videos are not official; therefore, the information contained in them cannot be used as reasons to resolve reports.
Not every features are mentioned in the changelog everytime, like tag changes and language addition in this version.
Slicedlime is known as "Tech Lead" for the Minecraft Java Game team. In fact, Minecraft Wiki and any other players usually treat his source as the official one. Maybe it's proper to let slicedlime himself to decide this is a bug or a feature.
Why would this be a bug, just because it's different? It seems to have been changed quite intentionally.