Lv_obj_t name cannot be entered "_"

I would like to ask all lv_obj_t controls when the Name property is customized, can not enter an underscore, is this a bug?

You cannot enter underscore in object Name field because it will be used to avoid and substitute spaces in the exported code. (There’s a tooltip notifying you about this, that you can only use numbers and letters, when you try to enter underscore, though it disappears fast.)