Found tiles labeled "unknown" and I can't dig or build on them. They look like ice tiles on the outsides of the edges, but I can't do anything with them. I tried exiting out of the game and reloading, it didn't fix anything.
I had a problem with this as well, but a little different. I looked at the second asteroid but didn't travel there, and my next care package had an Oxyfern seed, which I chose. When I tried to plant it, it kept saying there was no seed available so I found the seed on the resource list. It then appeared by my printing pod, but I couldn't plant it. I had a dupe sweep it into a bin, and then I could plant it from there.