Lava glitch

Recently, I was playing on a creative world, trying to make a pool of lava that you could swim in. While I was testing it, I left the window for a second to check a discord message, went back to the window, and found that my game closed out. When I opened the game and got back on the world, I found myself falling out of the world. After investigating it for a while, I found a pattern. When you leave the game while in lava, it teleports you out when you rejoin. Not only that, but apparently it allows for falling out of the world. It does teleport you to safe places but it doesn't care about the height. I would send a video showing this bug in action but I can't get one that's short enough that it would meet the file size requirements.