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It looks like some input to your `containerDefinitions` is potentially changing.  Any chance you can share the code for how you create the `containerDefinitions`?

Does the replacement actually happen if you proceed?  Or is it only shown during the "preview"?  If it's only about the preview - then this is likely related to <https://github.com/pulumi/pulumi/issues/4992>.

which field should be ignored, following the advise of that issue?

What's weird, is there are several other ecs containers that have the same configuration.  It just so happens that this service is the first one created.