In a world has a lot of redstones, chunk load and update very slow near the redstone construction which has a lot of redstones. But when start placing block it update instantly
Example: Connect redstone to redstone lamp near a huge redstone construction. When I turn lamp on, it takes a long time to display a lamp turned on, but when placing block it display turned on lamp instantly
And affect lightning too, when I cover, the light doesn't go away instantly, it takes time, placing block will make the light go away instantly
Also loading world at that huge redstone construction is slow, other place load completely
This is a bulk resolve of issues that haven't been updated to 0.16.0+ yet. Please comment below (To open the ticket) and update your affected versions. If you cannot reproduce the bug, please write in the comments so we can resolve it as "Cannot Reproduce". Thank You!