Not sure about a sticky thread, but I’m happy for work/part metadata issues to go here (and I’ve changed the title of the thread accordingly).
Note: Rovi sometimes treats fragments of works as separate performances even though they are contiguous on the disc. We have an action item to “fix” this our end, because it’s not something that Rovi will do.
Your example does appear to be a mistake and I’ve let Rovi know.
Roon’s metadata told me the album was by “Sir Colin Davis and the Royal Concertgebouw Orchestra” and the first work, “Pictures at an Exhibition” is split into three separate sections each called “Mussorgsky”.
I can’t even find the album on Allmusic, and I’ve searched under both Colin Davis and the RCO. I’ve managed to edit the artists but the Work seems to be bad metadata.