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I'm getting an error saying that it is refusing to delete a protected resource but it's not showing up in the diff so I don't know why it is being deleted. Any idea what to look for?

Hmm it was an AWS OrganizationalUnit where the parentId had changed

What did the output look like?  Very surprising you wouldn’t get a preview but would then get this message during the update. 

I was using `pulumi up --diff` . The output was a diff as I had other changes but the OU definitely wasn't in there. The same thing happens for an Account. I didn't check whether the `details` option showed the same thing. Unfortunately I have too many outstanding changes to reproduce it now but I think it should be easy to reproduce by:
1. Manually create OU `root/A` and `root/B`
2. Create the OU in pulumi as `root/A` and `root/A/B` 
3. Import the OUs
4. Run `up --diff` 