Do we know why barnacles are only appearing in nebulae yet?
We only "know" they are in Nebulae because we have been told. Without that information, we would be saying "somewhere near".
Nebulae seems to fit 3 sorts
1. Very small and just have the originating star (seen them called Planetary Nebula?)
2. Medium sized like Pleiades, often have NO systems within the actual cloud. They may look like they have systems within at first glance, but a bit of zoom and rotation shows that these systems are outside the actual cloud
3. Huge size, with hundreds of systems within the actual cloud
Consider Pleiades:
The system with the most Barnies is Pleiades Sector JC-U b3-2, which is a long way outside the cloud, 15ly or so. A casual observer would probably NOT consider it part of the nebula. If we were to "search the Nebula", nobody would look there.
Pleione and Merope are just outside the cloud, but on the edge
You can even rotate it so that Maia is not visibly in the cloud. I am not sure if any systems are in the cloud.
My first thought when we were told "Nebula" and "Barnicles" made me think that they filter fed the nebula gas to grow MA. However, they are found on planets with LOTS more available material in the ground than could ever be filtered from the cloud, so if the filtering is part of FD back story, I dont see how it is significant.
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Which means they're supposed point at Merope (the star), not Merope 5C ... since that's where they point in-system.
You can make that assumption if you like, but there is a long history of people conflating MB's one-liners WAY beyond their original intention and actual truth. He was commenting on the assertion that UA were bugged and should point at Barnacles sites, and/or the other Barnacle Nebulae (if such things exist)