This is not a bug, more like a collision: both IDProp "name" and struct’s name property share the same identifier, so there is some kind of odd sync between them. But the prop used by default uiList draw_item func is the RNA struct name, while the one used by the string field or accessed through python is the IDProp one (the one having the update callback).

You could even not define the "name" IDProp at all, but you have no way in this case to assign an update callback to the existing "name" RNA prop, I think, so would not be much useful in this case. Only real solution is to define a custom uiList with a custom item_draw func (and perhaps also use another identifier than "name", to avoid collision).