Why does Picard not save Recording ID to tags even though it implies that it does?

For ID3 tags (which are used with MP3 files), the recording id is saved in the UFID frame (see http://id3.org/id3v2.4.0-frames, scroll down to “4.1. Unique file identifier”), which might be treated different from other tags by software you mentioned. See also the tag mapping docs.

I assume VLC has some special handling here, since if you inspect the Metadata property of the MPRIS player interface exported by VLC on DBUS (this isn’t possible on Windows, I think), an “mb:trackId” with the recording id is included:

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