Image push updates

Description of the issue:
I’m visiting a website (zabbix hosted locally) which pushes graph images to the browser. They are not updating correctly and show broken or spinning. Out of the 12 graphs on the page 1/2 of them are always showing spinning or broken. This does not happen on other browsers FF or Chrome.

Steps to Reproduce (add as many as necessary): 1. 2. 3.
Load the page.

Actual Result (gifs and screenshots are welcome!):


Expected result:

Reproduces how often:
constantly

Operating System and Brave Version(See the About Brave page in the main menu):
MacOS Catalina 10.15.7
Brave V1.18.78

Additional Information:

Hi, @krockette

If you allow cookies and/or fingerprinting in shields, does it help?

I set both cookie blocking and fingerprint blocking to disabled and it did not help.