The bot has a stopping distance threshold of ~ 1.5 currently. This means that the bot will not attempt to navigate closer than 1.5 distance units away from the position you specify. The reason this occurs is that we have to limit the navigation precision due to digital rounding errors etc; if we try and be too precise we will bump into issues where the bot continues to run forever or does a "spinny dance" ( as we like to call it) where it spins around on a point forever because it can't reach the exact position we've specified. These are all tricky problems in 3d navigation that have no easy solution. We're working on a couple of possible fixes currently and will update you as soon as we've come up with something that will address the problem.
Edit: After a quick discussion I think we have a viable fix, it should be released over the weekend since I don't believe it will require any modification of the underlying nav code.
Edit: After a quick discussion I think we have a viable fix, it should be released over the weekend since I don't believe it will require any modification of the underlying nav code.