So I am getting rid of mycelium and big mushrooms in mushroom fields and the stems aren't dropping mushrooms but green books. This bug applies to both the red and brown mushrooms I created and edited a video, where the bug is shown, but unfortunately the video has bigger size than it is allowed. You can watch the video here.

And as I tested this bug in snapchot 20w51a, it seems to be fixed. But just to be sure I submited this report.