OpenGL rendering and Block loading and unloading

Fault 1: as shown in the figure above, when users use shift squat, the shadow will become transparent and the water can be seen through. This problem will occur regardless of whether the material package is used or not. I think this is an error made by OpenGL in rendering.
Fault 2: using vanilla official service will cause serious block loading stuck problem, that is, when the user transfers between different dimensions, the block will be reloaded, and then the server will have too much computation and get stuck, which can lead to downtime. I estimate that this should be due to the updated entity storage function in version 1.17. At the same time, when this problem occurred, I used the official "cave data package" to create a world of experimental settings.
Environment
version:1.17
Created Issue:
OpenGL渲染以及区块加载卸载问题
故障一:如上图所示的那样,在用户使用Shift下蹲时会导致阴影变得透明而可以透视过水,无论是否使用材质包都会产生此问题,我想这应该是OpenGl在渲染时产生的错误。
故障二:使用vanilla官服会产生严重的区块加载卡顿问题,即当用户在不同维度间传送时会导致区块的重新载入进而导致服务端运算量过于庞大而卡死严重时可导致宕机。我预估这应该是由于在1.17版本中更新的Entity Storage功能所致,同时发生该问题的情况下我使用了官方的"洞穴数据包"产生了试验性设置的世界。Environment
version:1.17
OpenGL渲染以及区块加载卸载问题OpenGL rendering and Block loading and unloading
故障一:如上图所示的那样,在用户使用Shift下蹲时会导致阴影变得透明而可以透视过水,无论是否使用材质包都会产生此问题,我想这应该是OpenGl在渲染时产生的错误。
故障二:使用vanilla官服会产生严重的区块加载卡顿问题,即当用户在不同维度间传送时会导致区块的重新载入进而导致服务端运算量过于庞大而卡死严重时可导致宕机。我预估这应该是由于在1.17版本中更新的Entity Storage功能所致,同时发生该问题的情况下我使用了官方的"洞穴数据包"产生了试验性设置的世界。
Fault 1: as shown in the figure above, when users use shift squat, the shadow will become transparent and the water can be seen through. This problem will occur regardless of whether the material package is used or not. I think this is an error made by OpenGL in rendering.
Fault 2: using vanilla official service will cause serious block loading stuck problem, that is, when the user transfers between different dimensions, the block will be reloaded, and then the server will have too much computation and get stuck, which can lead to downtime. I estimate that this should be due to the updated entity storage function in version 1.17. At the same time, when this problem occurred, I used the official "cave data package" to create a world of experimental settings.

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The issue with chunks not loading upon switching dimensions is
MC-227996and is a result of using optifine. As for the entity name background rendering problem, that is MC-162693.The problem doesn't forcus on wheather the chunk is loaded.
It occurred when the player travelling between the dimensions the chunk is ok,but the server may shutdown,just as the following image the fact is that player hadn't killed so much villagers but the chunks report the wrong message,I do believe that is when chunk unloading happened these.And the problem only occurred in 1.17.Neither 1.16 nor former versions.
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