Removing Grass will appear Peony

Removing tall Grass will make a twinkle of Peony ( very fast , cannot screenshot )
What I was expected:
It will disappear smoothly as usual
But Actually:
It twinkled an image of Peony and Peony disappeared in High Speed
Steps to trigger:
1 Find tall grass
2 Left click its lower part
3 #$%^&*@!Something goes wrong
More details to trigger this can be found in the image of Attachment