User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-39500837-20201221145912/@comment-1038387-20201221150331

The infobox thing is a knowm issue in VisualEditor.

Old messages take a while to convert; if there were a lot of comments, walls and forum posts, that can be considerably longer. There have been reports of deleted walls, but that was an exception on a very, very busy wiki. There's no exact time frame for this. 24 hours is a guideline, but no guarantee.