I built a small pool consisting of steps and water poured into them. When I moved away from him I noticed that the water passes through them a little. This problem I noticed more than once only with the steps.
Environment
Java version: 1.8, Operating System: Windows 10, 64bit, GPU: Nvidia GeForce GTX 1060, CPU: Intel Core i7-7700HQ 2.80 GHz 4 Cores, Operationg Memory: 16GB, Minecraft have 4GB operating memory, Minecraft: Graphics: Fancy, V-Sync: Off, Max Framerate: Unlimited, Fullscreen: On, Particles: All. Mipmap: 4, Clouds: Off, Render Distance: 32 chunks, Biome Blend: 5x5.
Duplicate of MC-127004