Workaround for a specific task completion
OK, this doesn't solve the exact problem that was asked, but this is how I accomplished the task I set out to complete when looking for this answer. I hope this helps others...
Scenario:
I was moving large amounts of files/folders to a new computer and wanted to avoid moving large unnecessary files. I landed on this page because I just wanted to open a folder and see the sizes of all the subfolders so that I could go into the large ones and delete unnecessary files.
Maybe this is what you're trying to do too. This may seem obvious, but here was my workaround:
Solution:
Just open the folder that you want to investigate and in the upper-right you'll see the "Search ..." box. Just type * (asterisk) in there, hit <Enter> and you'll be shown all files in all subfolders. Just below the search box change the view to "Details" so you can see the file sizes and sort by the "Size" column.
This is how I identified the large files I didn't want across many subfolders. I didn't really care about the folder sizes, but I thought that's what I needed to solve my problem.
You can do this at any folder level of course, it just takes longer the more folders you're trying to process at once.
Again, doesn't answer the specific question, but might answer the root question of someone who lands on this page.