CloudWatch metrics submitted via putProjectEvents do not show up in Evidently experiment's Result view

My region is Europe (Stockholm) and I am experiencing the issue described in the title.

Here is my dummy React app, which looks like this:

    import { EvidentlyClient, EvaluateFeatureCommand, PutProjectEventsCommand } from "@aws-sdk/client-evidently";
    
    const eviclient = new EvidentlyClient({ 
        region : 'eu-north-1',
        endpoint: "https://evidently.eu-north-1.amazonaws.com",
        credentials : {
            accessKeyId     : 'AKIA2NxxxxxxxxW6P3UL', 
            secretAccessKey : 'fo5hMrufII7eHZxxxxxxxxS/5ZHnXqIFXNXGHt2e'
        }
    });
    
    async function evaluate() {
        const command1 = new EvaluateFeatureCommand({ 
            project: "myprojectname", feature: "SolutionInterest",  entityId: "12.345.678.90"
        });
        const command2 = new PutProjectEventsCommand({
            project: "myprojectname", events: [
              { timestamp: new Date(), type: "aws.evidently.custom", data: { "userIP": "12.345.678.90", "value": "1" } }
            ]
        });
        let response1 =  await eviclient.send(command1);
        console.log('response1: ' + JSON.stringify(response1));
        let response2 =  await eviclient.send(command2);
        console.log('response2: ' + JSON.stringify(response2));
    }
    
    function App() {
        evaluate();
        return null;
    }

and the output on the console is the following:

[Log] response1: {"$metadata":{"httpStatusCode":200,"requestId":"f9f35837-4796-4456-925f-97be4afaa240","attempts":1,"totalRetryDelay":0},"details":"{\"experiment\":\"Test4\",\"treatment\":\"Variation2\"}","reason":"EXPERIMENT_RULE_MATCH","value":{"boolValue":true},"variation":"Variation2"}

[Log] response2: {"$metadata":{"httpStatusCode":200,"requestId":"fb29f316-85bc-4416-9dcf-920ba98fae57","attempts":1,"totalRetryDelay":0},"eventResults":[{"errorCode":null,"errorMessage":null,"eventId":"434115a0-0e18-4cae-a2fe-c53f8dca117d"}],"failedEventCount":0}

At the same time, I can see that the metrics do arrive via "CloudWatch -> Metrics -> All metrics" (with a 5 minute delay or so). But still, nothing is shown within Evidently experiment's Result view.

Btw, I am working in the console with the root user (just in case this might help).

So far I tried the following:

• to create a project and an experiment in another region - still same issue, so it is not region specific.
• to create an experiment with the same user identity, that is being used with client configuration - still same problem.
• to create a metric with and without rule pattern - no difference.

So here I cannot see any errors and the code has been simplified to the bare minimum.

Does anyone have any ideas, what is the cause of the problem here? Thank you!