On this note, there actually is a rare bug in the sand section that I've been unable to find the conditions for; if digging under a resource, sometimes the resource will disappear (not just visually) and will no longer be accessible/diggable. It's happened only a handful of times, so I apologize for not having more information. It's definitely some kind of edge case in the game's logic.
No worries, thanks for reporting all those other pesky bugs. You've seriously helped a ton already :) The sand is actually one of the more complex cell types under the hood, mostly because of the falling sand animation. That slight delay in how the sand settles can lead to a bunch of visual quirks and edge cases, especially since different browsers handle the animation timing a bit differently. I really appreciate the heads-up about the disappearing resource.