Issue with Background Image Disappearing in Nagvis After Changes in CheckMK

CMK Version: 2.1.0p28

OS Version: 20.04.6

When we make a change in CheckMK, the background image in Nagvis disappears. Only the arrows we created in Nagvis remain. The background image is a PNG file. We changed it to JPEG, but the problem still occurred. Unfortunately, if a JPEG file is used, the overview in Nagvis is not displayed on MacBooks as it is on Windows machines.

Hello. we also experience same issue, any fixes?