The same issue has been reported here:

The solution was to skip upgrading the "Prometheus metrics" plugin.
If you have already updated the plugin, then downgrade it and restart JS.

On Thursday, October 17, 2019 at 8:22:26 PM UTC+3, kochrist wrote:
> Hi all,
> I have upgraded Jenkins from 2.176 to 2.190.1 as well as the suggested 
> plugins (the ones without dependencies) and I am facing the following issue.
> I am creating a Pipeline script and I am saving the job. Afterwards I am 
> opening the same job and the Pipeline script is empty in the UI.
> If I don't Save/Apply the empty job I can see the 'Hello World' log in the 
> Console output when running the job.
> If I save the empty Pipeline script then it is completely lost..
> I had to revert Jenkins back to 2.176 (from a backup) as this was 
> affecting all my jobs.

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