Actually it does but it seems you didn’t grasp what “until” means.
What two phrases does it connect in the verse?
"Knew her not" and "until she gave birth to Jesus". So? Where does it say anything about what happened after? "I did not fire the gun until [eos] the turkey fell on the ground dead". Does it mean I fired the gun at the dead turkey? I gave you an example of "The field was called X until [eos] ths day". Does that mean the field got renamed after the gospel was written?