Right after starting a world, blocks don't update

I was going to make some fireworks in my creative world, so i put down a crafting bench and right clicked it, but nothing happened. Similar things have happened in other worlds too, so I experimented. After breaking a block with a flower on top, the block disappeared, but the flower didn't. Redstone also acted funny (see pictures). After a few minutes the blocks updated and the flowers and redstone fixed itself. Then, the dropped items did not go into my inventory when I stood on top of them. I did a quick search on the site but didn't find anything similar.