Server Side Diff Strategies for mutation webhook for Secret

[jaebchoi]

Hi Everyone,
I have question regarding server side diff strategies in ArgoCD.
I have enabled the Serverside diff and mutationwebhook for my application.
I can see some plain text I injected using mutationwebhook seems to work, but not for the secret (i.e. base64ed one)

metadata:
annotations:
argocd.argoproj.io/compare-options: ServerSideDiff=true,IncludeMutationWebhook=true
...

Wondering does this also support base64 encoded changes? I noticed this feature is beta so would that be some edge cases to be supported?