Adding key with confirmation option to ssh-agent gives "agent refused operation"

[wondering639]

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Prerequisites

• [X] Write a descriptive title.
• [X] Make sure you are able to repro it on the latest version
• [X] Search the existing issues.

Steps to reproduce

Try adding a key with the -c (confirmation) option, it will fail with "agent refused operation"

PS C:\Users\myuser> ssh-add -c $env:USERPROFILE/.ssh/mykey
Enter passphrase for C:\Users\myuser/.ssh/mykey (will confirm each use):
Could not add identity "C:\Users\myuser/.ssh/mykey": agent refused operation

Expected behavior

ssh agent should not refuse this operation (-> it should support it)

Actual behavior

buggy or likely not supported at all, even though the option is there on ssh-add?

Error details

No response

Environment data

not relevant

Version

OpenSSH_for_Windows_9.5p1, LibreSSL 3.8.2

Visuals

No response