I don't think it is convention to use the "Original Year" tag in this way. From my understanding, it is meant for cover versions of songs.
All what that 20 year old informal standard document for id3 says is: "TORY [Original release year]"
It doesn't explain or define what is meant by 'original', nor does it pertain to alternative tagging schemes such as Vorbis, nor does it say you cannot have user defined id3 TXXX tags for customized dates.
And what if you have a 20 cd box set from 2020 that contains a full original album from the artist that dates from 1980, and on that album is a song that was released as a single in 1979, which was an alternative version from an earlier recording from the same artist they recorded in 1975, which was a cover version of a song from another artist in 1960.
What is 'original' here?
And is your head already spinning?
But that is both not the point of my request, and it is the point.
Because of the rather vague and chaotic ways in which dates (years) are handled by software, organisations and users, many MusicBee users will have created their own custom and virtual tags to handle and store different sorts of dates.
MusicBee already has the concept of 'Decade'.
But it does not allow for users to make it look at a specified year tag to decide on the decade.
Not a crucial feature, but in my mind it makes sense and would make things just a little bit easier.