Custom attribute "key" is not applied

[AndrewKMoses]

Affected Version

2025.4 - LTS

Affected capability

Data Objects

Steps to reproduce

Add event listeners for DataObjectDetailEvent::EVENT_NAME and/or DataObjectEvent::EVENT_NAME and set do

$customAttributes->setKey($event->getDataObject()->getKey() . '-test');
$customAttributes->setIcon(
    new ElementIcon(ElementIconTypes::NAME->value, 'car')
);

$event->setCustomAttributes($customAttributes);

Actual Behavior

The icon is shown in the detail view and tree, but the key is not applied in any of the tree or detail view.

I see no references of key in the studio ui code for custom attributes. I only see references for icon and tooltip.

Expected Behavior

The key should be applied in the tree and detail view.