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In theory the properties after the `~` in the diff indicate which properties have changed. Running `pulumi preview —logtostderr -v=9 2&gt; out.txt` and looking for `replaces=` can give more insight. 

There is a change in progress now which will provide more visibility into this by default. See  <https://github.com/pulumi/pulumi/issues/2453>

Not new - but a pretty low level debugging mechanism. Once we improve the diff reporting per the issue above this should t be necessary. 