Weird entities present in editor mode

The bug

In editor mode, the following entities are present:

• editor:location_pointer_idle

• editor:location_pointer_selected

• editor:map_marker

• editor:ruler_idle

• editor:ruler_pointer_selected

They show up in commands like /summon and the type selector argument. They have untranslated names. They can be attacked and killed, and make player hurt sounds. They have gravity and collision. Two of them have a simple spinning animation. One of them uses a default blockbench texture.

It appears to be unintentional that these entities are present and accessible.