Publish over SSH plugin not using Jenkins credentials

[Isegrimm]

Hi,

We have an exisiting Jenkins instance (2.289.3) with 1.21 installed, which runs this plugin with a stored Global credential (SSH keypair) and is able to connect to the SSH host just fine.
As an upgrade path in progress we also have a new Jenkins instance (2.452.2) running 1.25 with the same setup, on which the plugin fails to connect, unless I enter the key directly in the Publish over SSH config, even though it's configured identical in a Global credential.

So I think that somewhere between versions 1.21 and 1.25 the Jenkins credential provider is not used anymore, requiring credentials to be entered directly in the 'Publis over SSH' configuration. Is that a correct assumption or am I missing something completely obvious?

I have searched online for this problem and the only info I found was this issue: #70
So, is this a feature or a bug? And if it's a bug, is there any update on fixing it?

[Isegrimm]

I understand from #70 (comment) that it is a bug which still needs to be fixed.
So to make it work on the new version, I'll configure the SSH key for each node seperately.