The migration began three hours ago on a D&D world currently being created and is still ongoing, with my dedicated server running at 50% capacity on a Node.js foundry. It took her 4 hours and 45 minutes in total.

Furthermore, the logs here contain links to dnd5 24 or 14 as here @uuid[Compendium.dnd5e.actors24.Actor.mmRoper000000000], which displays blank pages.
When editing, I can see that they still contain the content, but as soon as there is a link, nothing is displayed.