Dynatrace is confusing the contexts of the requests. The error caused by Request A is being reported in Request B. We can see in the Error tab the stack shown in Request B is from Request A.
Error tab (StackTrace ) In the Error tab the exception shown is System.TimeoutException with the correct time set to 3s and in StackTrace it shows ServiceB, ControllerB when it should be ServiceB, COntrollerB
I tried to identify a pattern in the ThreadIDs or PODs even though it was a Kubernetes cluster and each request was going to different PODs and even then there was no correlation.