I think this merits a comment.  Based on my understanding, this could work: "If there is already a partially or fully entered address in the typing area, force it to be converted into a bubble, even though the resulting address may not be valid.  If it's not valid, that bubble can subsequently be edited.  This helps avoid the user losing anything they typed in."

Note that adding both a command and a space I think is somewhat overkill; normally we split on just one of those characters having been typed.