Recently we have migrated from SVF to SVF2 in our APS (Forge) viewer. However, sometimes we are receiving this error while trying to load a model on the viewer:

and this error in the console:

And when we go to Otg.js (through the console error) here is when the error has been thrown:

These are the options which we pass to Autodesk.Viewing.Initializer to load SVF2 models:

var options = {
    env: 'AutodeskProduction2',
    api: 'streamingV2_EU',
    getAccessToken,
};

And this is how we initialize the viewer:

Autodesk.Viewing.Initializer(options, () => {
    const config = {
        extensions: [
            'Autodesk.DocumentBrowser',
            'Autodesk.Viewing.MarkupsCore',
        ],
    };

    const container = document.getElementById('viewer');

    if (container) {
        // viewer-keeps-showing-old-model
        Autodesk.Viewing.endpoint.HTTP_REQUEST_HEADERS[
            'If-Modified-Since'
        ] = Date();

        const viewer = new Autodesk.Viewing.GuiViewer3D(
            container,
            config
        );

        viewer.start();
    }
});

And this is how we load the model:

Autodesk.Viewing.Document.load(
    'urn:' + urn,
    onDocumentLoadSuccess,
    onDocumentLoadFailure
);

const onDocumentLoadSuccess = (doc) => {
    if (doc.docRoot.data.status === 'success') {
        const geometries = doc
            .getRoot()
            .search({ type: 'geometry' });

        doc.downloadAecModelData();

        viewer.loadDocumentNode(doc, geometries[index], {
            createWireframe: false,
            applyScaling: 'm',
            isAEC: true,
        })
    }
};

And this is how we create buckets, upload and translate the models:

await new BucketsApi().createBucket(
    { bucketKey, policyKey: 'persistent' },
    { xAdsRegion: 'EMEA' }, // 'Europe, the Middle East and Africa'
    oauth2Client,
    credentials
);

await new ObjectsApi().uploadResources(
    bucketKey,
    [{ objectKey, data }],
    { useAcceleration: false, minutesExpiration: 15 },
    oauth2Client,
    credentials
);

const job = {
    input: { urn },
    output: { formats: [{ type: 'svf2', views: ['2d', '3d'] }] },
};

await new DerivativesApi(undefined, 'EU').translate(
    job,
    { xAdsForce: true },
    oauth2Client,
    credentials
);

When we use api: 'derivativeV2_EU' everything seems fine, but with api: 'streamingV2_EU' sometimes we have this issue (especially our users in France).

We tested this with different browser and the result is the same.

Is there something we’ve missed causing this?