Hi,

Recently, we have upgraded Jenkins to 2.414.1 and using the Git Plugin -  5.2.1.

Select "Accept first connection":

'Manage Jenkins' -> 'Security' -> 'Git Host Key Verification Configuration' -> "Accept first connection"

Go to Dashboard -> select any job that interacts with git repositories:

When selecting the git branch or trying to establish a connection:

The default value has been returned 
An error occurred while download data
Command "git ls-remote -h -- git@git-test.com:sample/testing.git" returned status code 128:<br>stdout: <br>stderr: command-line line 0: unsupported option "accept-new". <br>fatal: Could not read from remote repository.<br><br>Please make sure you have the correct access rights<br>and the repository exists.<br>
Please look at the Log
Please check the configuration 

Hitting the above issue, as per our requirement, we wanted to use 'Git Host Key Verification Configuration' -> "Accept first connection" only.

Can you please guide me on how to fix the issue, or is there a new version of the plugin?