Fox Jumping to Lava (Huge bug)

Hello dear administrators and readers of the site, this bug was not found by me, but please correct this defect, it’s strange that the fox saw a chicken under the lava, and even jumped there. I understand that the code had a specially written distance from which the fox attacks the chicken, but this is pretty stupid. I understand that chickens cannot spawn under lava, but the error is really huge. I have attached the video as a link to Google Drive.
https://drive.google.com/file/d/1l30-mXF8USxR4DwjOjY_3QVpGuDEjz2Y/view?usp=sharing