In 2020 a new edition of Unfinished Tales was published, illustrated by Alan Lee, John Howe, and Ted Nasmith. See here.
I did not manage to find an older version of this book which was illustrated. I did, however, see that quite a few new editions of illustrated books by Tolkien were published in 2020. For example, here is a very similar edition of The Fellowship of the Ring, illustrated by Alan Lee.
The thing is, I did find a much older illustrated edition of the Fellowship of the Ring, published in 2011. It is not just another illustrated edition: it was illustrated by Alan Lee as well, and I strongly suspect that it features the exact same illustrations.
In this video, it is said that the 2020 edition of Unfinished Tales (linked above) is the first time the book has been illustrated. However, I suspect that it is just a re-release of an older version, featuring the exact same illustrations.
What was the first illustrated edition of Unfinished Tales? Does the 2020 edition feature illustrations that were already featured in an older edition, or are these new illustrations?