Hummm, I can't describe it, but I recorded.
Its weird. Sorry for lack of info, but I couldn't guess what is causing the issue. I know that some block models are rendering wrong.
And only on some conditions.
With some conditions it render wrong, but with other conditions it render correctly, and something is lagging a lot. I created this world before the recording.
Since the video has 300MB I uploaded on YT
https://www.youtube.com/watch?v=Z_JZHFVDy2M