I play on a realm, and as a result, I have no way of really digging into any of the server-side aspects of the bug (that I'm aware of, anyway). My realm features a Large Biomes map for a few friends and I to run around and explore. Because we're going to end up getting separated, my intention is to set up teleports for us to easily connect to each others builds.
Unfortunately, the performance in 1.14.x has been more than a little lackluster. If I set up a teleport to the world's surface, I will routinely get stuck in the ground. If I'm any lower than ~20 on the y axis, there is a possibility that you will fall through the unrendered chunk and die to the void.
I can't speak to how it was in 1.13.2, as I wasn't playing much then, but this is more than a little annoying. I've died once to falling through the world, and I hope it stops at that. I was previously playing on higher graphics settings, but turned them down because I thought maybe that could have contributed to the problem. It wasn't. I didn't die until I turned them down.
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This also happens with boats, and also more often happens in deep water, though also happens when you come ashore. When you go to exit the boat, the character will bounce until you're finally able to move off the area where the boat is.
The boat never seems to reappear.