This 27-July-2019 CNN report mentions:
The remote Pacific outcrop, called the Dokdo Islands in South Korea and the Takeshima Islands in Japan, made headlines Tuesday following an alleged violation of the airspace above them by a Russian jet.
but my question is not specifically about these island. Instead, I'd just like to ask if there has every been a case where two countries have ever jointly shared territorial waters of an island (or group of islands) that was not otherwise already inside either of their other territorial waters. The islands mentioned in the article are one geographical example, given for the purposes of clarity.
It's fine to speculate in this paticular case, but I'm only asking about any precedent of this, or why it may be impossible due to political issues or those of international law.