The possible improvements based on KOGITO-8104 review:

• When both type and icon are properly set, the type takes precedence, so the "type image" is rendered in the diagram. It should be to set in opposite way: the icon should always take the precedence if a valid image is used.
• If icon is set to empty string and type is set to non-existing type, the rendered image is empty circle, but when type is set to empty string and icon is set to non-existing image, or invalid base64 image, the rendered image is the default one. This could be unified. The default image could be rendered when non-existing type is set.

Expected Result

• metadata.icon should overtake precedence from metadata.type
• if metadata.icon is incorrect, now always will be default state shown if metadata.type is not set or incorrect.