Kubernetes SDN Connector issue after upgrading to FortiOS 7.2.12 to 7.4.11

Hello,
We are using a FortiGate device integrated with a Kubernetes Connector. The system was working properly on FortiOS 7.2.12, but after upgrading to 7.4.11, we started experiencing the following issues:

SDN Connector errors The following errors are observed in the GUI: Invalid SDN filter: K8S label node.kubernetes.io/exclude-from-external-load-balancers Invalid SDN filter: K8S label node-role.kubernetes.io/control-plane

We are experiencing 504 Gateway Timeout errors on outbound traffic to servers running behind Kubernetes. Based on checks performed on the Kubernetes side: There is a noticeable latency/performance degradation in the environment However, after downgrading back to FortiOS 7.2.12, these issues are no longer observed. Therefore, we suspect that the 504 errors and performance degradation are related to FortiOS 7.4.11.

Rollback result After downgrading back to 7.2.12: All issues are resolved Kubernetes services are reachable again SDN connector errors disappear.

Additionally;

Debug output The following debug commands were executed
diagnose debug application kubed 
diagnose debug enable
No error logs were observed in the debug output

However, SDN filter errors persist in the GUI