This is an old bug, and is probably caused because the dragon head is larger than 1 block and Mojang forgot to include the size difference, so the renderer optimizes it out
How to reproduce
Place a dragon head, and turn to the side where the nose is, it should disappear
Comments 3
it happened to me several times, but now i can't reproduce too, maybe it was a problem with optifine or my shaders
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers like Hypixel, please contact them first as they run modified server software.
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I was unable to reproduce, can you please provide a video with the debug screen enabled showcasing the bug?