Today, me and a friend decided to play together (we both are on Steam version, with mouse and keyboard)
My friend took a vehicle and few other rover behind the first one to go gather some research "balls" . My friend ALWAYS had troubles with vehicles. The rovers were just flipping over for random reason and etc. This time, they flipped over, and he decided to let them like that, because he knew that if he were to put them back on their wheels, they would flip over again. So he drove like this for a while, and at a moment, the flipped over rovers just suddenly "jumped" and started wiggling furiously and randomly, hitting each other and etc. It went worse, and lead to my friend being stuck in his vehicle, while the vehicle was rising in the air with the other rovers, just doing an absolute mess in its movements.
The first pic attached to this topic is my friend who sent me a screenshot of what was going on on his side. At some point, he told me he wasn't seeing any other rover, just the one he was in, and was barely seeing the link between them anymore.
Then, at some point, I told him "Dude, just go offline" and he told me that he didn't have to, because his vehicle was landing again! Alone, but landing. When he was finally able to get out of the vehicle, the vehicle disappeared, and he died from a lack of oxygen a minute later.
Later, we saw the little beacon of them when our spaceship, orbitting around the planet. We landed next to them, and I saw them... Stuck in the sky. (Second screenshot)
My friend wasn't seeing them though. I was the only one seeing the beacons, the vehicles, and the bits of vehicles flying around. The vehicles weren't moving, same with the bits scattered around. I then decided to try to build a path to reach the vehicles. After a long time and some deaths, I reached them, they started glitching again, and then stopped. They kinda fell down for a bit, but then they stopped again. (third screenshot)
I had been able to grab one of the research "ball" from them, and dropped it in the air so they could fall down there. Sadly, they fell for a bit, and then got stuck in the air as well. (I don't have any pictures of that sadly)
So I tried to reach the vehicles, to climb in it, hoping it would solve the problem. So I climbed in them, and they were stuck in the air. I could flip them back on their wheels at first, and when I climbed in, they acted as if they were in no gravity zone. (Fourth screenshot. They moved a bit , literally floating, and then nothing.)
When I got out of them, I tried to break the link between the vehicles but it didn't help. Then, a sandstorm came in, and the vehicles floated away with the wind, and I couldn't reach them anymore. I just stopped trying after this.
If you have any questions about the bug, I will gladly answer them, if it can help trying to solve it.
PS: I also had a problem with "no gravity" but this time with items, not vehicles. But I will make a whole new topic next to that, and post the link of it as a reply to this topic.