i just got a very peculiar set of results in a preview and fortunately it's on an AKS cluster i don't need anymore so i proceeded... the actual updates it did were entirely different to what it previewed:

Resources:
    ~ 2 to update
    - 78 to delete
    +-15 to replace
    95 changes. 8 unchanged
~~
Resources:
    ~ 2 updated
    101 unchanged

Duration: 5m49s