Description of problem:
We used to be able to sort events by adding --sort-by='{.lastTimestamp}' to the "oc get events" but with 4.5.1 this no longer seems to work:

oc get events --sort-by='{.eventTime}'
F0715 16:09:45.682600   89491 sorter.go:353] Field {.eventTime} in [][][]reflect.Value is an unsortable type: interface, err: unsortable type: <nil>

All the date fields in the event record report the same error.

Version-Release number of selected component (if applicable):
$ oc version
Client Version: 4.5.1
Server Version: 4.5.1
Kubernetes Version: v1.18.3+8b0a82f

How reproducible:
All the time