I cannot reproduce them but, since you haven't posted any details about your coordinates, or your zoom factor, it's difficult to replicate the same situation here.
Do they go away if you turn off "Enhanced Atmospheric (BETA)" ?
If yes, it's a known problem with it, which can happen with any object or scenery (it's the same issue of pixelated cloud borders ), that's why it's called Beta, and there's really nothing we can do to prevent it, only LM can fix it.