I have upgraded my istio.

istioctl version

client version: 1.25.0
istiod version: 1.20.3
istiod version: 1.25.0
data plane version: 1.25.0 (22 proxies)

I want to delete the old version v1.20.3. So I tried the following command:

istioctl uninstall --revision 1-20-3

No resources will be pruned from the cluster. Please double check the input configs

✔ Uninstall complete 

And the v1.20.3 is not get uninstalled. Any idea?

By the way, if I type a wrong version, I'll get following:

istioctl uninstall --revision 1-20-4

Error: could not find target revision