So, It's definitely still pasting at least some ores over core seams - leading to them being closed when revealed by player or map view. It may only be in the circumstance which I am about to describe, as an addition to minor bugs.

I can confirm that placing a core miner deletes SOME of that ore, but opens the seam for business as usual.

The minor issue I have identified is that submerged ore is spawning on land, probably as long as at least some of it is spawning in water. In at least one case, the majority of it is on land.

This does not result in any real functional difference.

No prompt fix is required.

It also occurs to me that core seams generate small islands. Perhaps this is related. Zooming out and just visually appraising the scene, it looks like this is quite likely - the core seam and island are appearing under the submerged ore.

Yeah, I knew it was still happening sometimes. My best theory at the moment is that when a core seam straddles a chunk boundary, the seam will be closed if they generate in the wrong order. (It's been long enough since I looked at this that I don't remember which order is the wrong order.) Since it seems to be effectively cosmetic, and I haven't come up with a fix that doesn't slow down chunk generation even more, this is probably as good as it gets.

I hadn't tested this with Dredgeworks, but I think you're probably right about what's happening there.

Yeah, again, I can't thank you enough for this mod. I don't care if it has bugs. I just want to document them in case something more major requires you to revisit it.

This relates to a surface generated in the first release. Not sure if it is still an issue (though I'd guess you haven't changed this). I have a patch which is clearly cryonite and lead ore. The cryonite being smaller. Mousing over, it shows lead ore. But mining it gives both sequentially like your run of he mill mixed patch.