After labelling a space and then selecting that label from the list of labels the space is not displayed in the list of labelled content. Pages are shown fine but spaces never appear. This means that space labels are virtually useless as the only way I can find to navigate to a space via its label is to search for the label name and then find the space amongst the list of search results for that term (it doesn't appear that space labels are promoted above other matches, unlike page labels).