Since upgrading to

@pulumi/aws

v4.10 we have got. Any ideas?

aws:elasticache:ReplicationGroup (news-shared-branch-deploys):
    error: aws:elasticache/replicationGroup:ReplicationGroup resource 'news-shared-branch-deploys' has a problem: engine_version: Redis versions must match <major>.x when using version 6 or higher, or <major>.<minor>.<bug-fix>. Examine values at 'ReplicationGroup.EngineVersion'.

Here is the code

const redisResource = new Redis(
    prefix,
    {
        engine: 'redis',
        engineVersion: '6.x',
        AZs: privateAZs,
        subnetIds: privateSubnetIds,
        securityGroups: [
            securityGroups.redisSecurityGroup.id,
            securityGroups.essentialIcmpSecurityGroup.id,
        ],
        vpcId,
    },
    {
        provider: deploymentProvider,
        awsRegion: 'ap-southeast-2',
        awsRole: getRoleArnToAssume(),
    },
)

I'm assuming you're using something like a component resource to abstract over the ReplicationGroup resource, but I've just run this and it worked with no problems:

const rg= new aws.elasticache.ReplicationGroup("rg", {
    availabilityZones: [
        "eu-west-1a",
    ],
    replicationGroupDescription: "my replication group",
    engineVersion: "6.x",
    engine: "redis",
    numberCacheClusters: 1,
    nodeType: "cache.t3.micro"
})

What about with 4.1 of the aws package?

that worked too

I think we have got to the bottom of it. https://github.com/hashicorp/terraform-provider-aws/issues/15625 Caused the engine version to be 6.0.5 in state, with the provider update it needs to be 6.x in state, otherwise preview fails