I was in the process of deleting 400GB of files from the Trash when I needed to restart Finder.
The Trash emptying progress bar was about 1/3rd of the way through.
Now DaisyDisk tells me I have 400GB of Hidden Space on a 1TB SSD.
I've restarted, waited a few days, and the space has not become available again.
Is there anything else I can do to reclaim this space?