Are state migrations in Terraform supported for both resources and data sources?

I found Resources - State Migration tutorial that describes the process of implementing a state migration for resources and it worked perfectly for me when I implemented it for foo resource.

However when I tried to implement the same thing for foo data source where I literally reused the same upgrader methods (since the migration is the same for both resource and data source):

SchemaVersion: 1,
StateUpgraders: []schema.StateUpgrader{
    {
        Type:    resourceExampleInstanceResourceV0().CoreConfigSchema().ImpliedType(),
        Upgrade: resourceExampleInstanceStateUpgradeV0,
        Version: 0,
    },
},

I'm running into a .bar: missing expected [ error when trying to run terraform plan for an existing TF state with a data source (version 0) and updated main.tf that contain an updated definition of foo data source that matches its updated schema.

Here's

func resourceExampleInstanceStateUpgradeV0(ctx context.Context, rawState map[string]interface{}, meta interface{}) (map[string]interface{}, error) {
    barString := rawState["bar"].(string)
    rawState["bar"] = []interface{}{map[string]interface{}{
        "name": barString,
    }}
    return rawState, nil
}

I might be able to come up with a fully reproducible example that will include more code but I figured it might be useful to ask about it more generally since the tutorial named "Resources - State Migration" and not "Data Sources - State Migration".

On the other hand,

  "resources": [
    {
      "mode": "data",
      "type": "bar",
      "name": "example",
      ...
      "instances": [
        {
          "schema_version": 0,

contain schema_version still so it might be supported.