For ID3 the recording ID gets written to an UFID frame with the "owner identifier" set to "http://musicbrainz.org", see https://picard-docs.musicbrainz.org/en/appendices/tag_mapping.html#id21 and https://github.com/id3/ID3v2.4/blob/master/id3v2.4.0-frames.txt#L230-L250
The tool you use to display the tags does not seem to support showing UFID frames.
If you actually want the recording ID to be set to a TXXX frame you could add the following as a script in Options > Scripting:
$set(_id3:TXXX:MusicBrainz Recording Id,%musicbrainz_recordingid%)
This will cause the recording ID to be written to TXXX in addition to the UFID frame, the result will be something like this:
For ID3 the recording ID gets written to an UFID frame with the "owner identifier" set to "http://musicbrainz.org", see https://picard-docs.musicbrainz.org/en/appendices/tag_mapping.html#id21 and https://github.com/id3/ID3v2.4/blob/master/id3v2.4.0-frames.txt#L230-L250
The tool you use to display the tags does not seem to support showing UFID frames.
If you actually want the recording ID to be set to a TXXX frame you could add the following as a script in Options > Scripting:
This will cause the recording ID to be written to TXXX in addition to the UFID frame, the result will be something like this: