The bug I deal with somewhat often is an odd one. Basically, while mining stone, sometimes the game gets a bit laggy and the stone I mine doesn't drop anything. If I proceed to mine, the game will sort of freak out, and go back where I was right before I mined the blocks that dropped nothing. This commonly happens when caving or strip mining, and one time it freaked out so oddly, that at one point, it created an invisible wall in my mine. I looked this up and found no results, and I'm really unsure if this is just me. Otherwise, I have no major issues and 1.14 is pretty decent so far! This issue does occur a bit often if I am mining, (which I do often) but worst case scenario, I can bear it.