Entity Partly disappeared

The circle I filled with the picture material will disappear partly when it is too close to the ground, and it looks like it is blocked by something
It’s normal when I’m on the PC side, but this happens when the same code is on H5. Can someone please help me answer this question?thanks!
My cesium version is 1.83


Welcome to the community! This issue has come up in the community forum various times over the past few months. The solution revolves around updated all of the height-related members of the object that you are showing. Can you please give this a try? Finally, I recommend upgrading to the most recent version of CesiumJS. Is there any reason in particular why you have not done this already?