I know, this is probably a duplicate of something else, but I couldn't find anything for this version.
When new chunks get generated, blocks, that are supposed to fall, don't fall until they get a block update. This creates the floating gravel in the Nether, floating sand in the overworld, etc. Easy solution: Let every generated block get a block update as soon as it gets generated. Yes, a bit more lag, but also a big bug less. It would also help and create less lag if random ticks create block updates. But then people who use bugs (BUD) complain if that gets fixed.
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Not WAI. Just won't fix. It has too much performance impact to do that.

Ok, that I can accept. But then my second idea would be better: Random Tick creates block updates. This way sooner or later the block will fall. The only "downside" to this would be that some systems that use bugs wouldn't work anymore. But in my opinion that's no bad thing, because bugs should be fixed anyway. (I'm especially referring to the quasiconnectivity that breaks other redstone designs that should normally work.)

Could the speculation about the picture of an enderman in the nether have somthing to do with a try to fix it? Floating gravel can mostly seen in the nether.
WAI. MC-750