When they first got changes i presumed they were cosmetic changes to the barnacles , then they got the green goo,, more cosmetic? seems doubtful ,, so some sort of development in each patch
First main change was 2.2 the small grey cell like things around the base of the barnacle gaps, and the first cracking.
2.4 latest change with the green goo and cracks further out from where they were before.
2.0 Barnacles with no cracks etc, just barnacles
2.2 cells and cracks.
https://i.imgur.com/Uuhc2eal.jpg
then the 2.4 changes, cracks further from barnacle and green goo around barnacle
https://i.imgur.com/U53IECul.jpg
Expected,, Merope is a Cyclic barnacle system, 4 weeks broken and 2 weeks ripe. green stuff, well every barny gets those upgrades for 2.4. Wont be ripe for long, but will be ripe again ,, they never die.
Forests,, they seem different, maybe all regular barnacle purpose isnt MA but whatever gets farmed by thargoids.
The forest site doesnt seem efficient at MA, far fewer than would expect from that number of barnys , materials ? few material spikes, most spikes are barren and blow in one hit , no materials or MA.
Material and MA spikes take a couple of shots. and the big indestructable spikes around big barny ? . seems more to deter or hinder , protect the barnacle from humans.