containerd - cannot update memory of a running container lower than its current memory - kubernetes

Question

I am using 'crictl' tool to work with containerd runtime containers (under kubernetes) in a managed cluster.
I'm trying to set the memory limit (in bytes) to 16MB with the command:
crictl -r unix:///run/containerd/containerd.sock update --memory 16777216 c60df9ef3381e
And get the following error:
E1219 11:10:11.616194 1241 remote_runtime.go:640] "UpdateContainerResources from runtime service failed" err=<
rpc error: code = Unknown desc = failed to update resources: failed to update resources: /usr/bin/runc did not terminate successfully: exit status 1: unable to set memory limit to 16777216 (current usage: 97058816, peak usage: 126517248)
: unknown
> containerID="c60df9ef3381e"
FATA[0000] updating container resources for "c60df9ef3381e": rpc error: code = Unknown desc = failed to update resources: failed to update resources: /usr/bin/runc did not terminate successfully: exit status 1: unable to set memory limit to 16777216 (current usage: 97058816, peak usage: 126517248)
: unknown
At first I thought that maybe I cannot set a memory limit directly to a running container lower than the limit that appears in the kubernetes yaml.
Here Are the limits from K8s:
Requests:{"cpu":"100m","memory":"64Mi"} Limits:{"cpu":"200m","memory":"128Mi"}
But not, even setting a memory limit above the K8S request (e.g. 65MB) gives this same error!
This works on Docker runtime - I'm able to limit the memory of the container. Yes, it might crash, but the operation works..
Then, I tried to give a memory limit higher than the current usage, and it succeeded...
Can anyone help understanding this error and what might be causing it on containerd runtime?? Is this indeed a limitation that I cannot limit to a lower memory currently used by the container? Is there a way to overcome that?
Thanks a lot for your time!!!