Hi, I am finding pulumi is not doing things it says it will in the preview. i.e preview shows

Resources:
    + 17 to create
    - 2 to delete
    19 changes. 8 unchanged

and after the update it shows

Resources:
    + 15 created
    8 unchanged

two things have failed to create so the +15 is expected but pulumi has made no attempt to delete the resources and no error is mentioned regarding the resources to be destroyed. Am i misunderstanding something?