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In case anyone else has this error, there are workarounds. See <https://github.com/pulumi/pulumi-aws/issues/1784> - the gist is you create the prefix list with no entries. After it is created, you add entries one at a time using something like `new ManagedPrefixListEntry(`${name}-e1`,{prefixListId: &lt;prefix list id&gt;, cidr: '123.123.123.123/32'})`