Shadow topic does not keep the main topic type

Moving a topic and leaving a shadow topic in place, the latter topic loses the main topic type and becomes regular one.
This means, if the moved topic has a sticky or announce type, the shadow topic will still be a regular topic.
This leads to the fact, for example, that shadow to an announcement is going to be lost in normal topics.

Thus, it seems to be correct that the shadow topic should keep the main topic type in the forum.