Chromium-based traffic issue

[AngeloOghittu]

Hello Experts,

Our client experienced a drop in internet traffic. After running tests, they detected that all traffic generated with Chromium-based browsers was being dropped by the firewall for some unknown reason. Other traffic generated by other browsers, such as Firefox or ICMP traffic, was not affected in the same way.
We haven't determined the cause of the problem; we haven't seen any logs or indication that the firewall was dropping traffic. It simply dropped it. We tried disabling protection in the Security Profile (antivirus, anti-spyware, URL, etc.), but nothing changed.
As a corrective measure, we suspended the active firewall so the passive one could take over. Everything was back to normal.
They found out that the issue PAN-254236 could be related, but the workaround to Disable SSL/TLS handshake inspection didn't work.
Also, PAN-254236 was fixed in PanOS 11.2.1, but they don't see it feasible to upgrade to 11.2.x.
The firewall is running 11.1.4-h7.

Any suggestions to fix this?

Thank you
Angelo