After an update of Jenkins core to version 2.277.3 every pipeline job with parameters loses all its parameters after editing it in UI.

Steps to reproduce:

1. Push a pipeline job to Jenkins using JJB
2. Jenkins -> login -> Find the job -> configure
3. Change any of the job config settings (optional) 
4. Save changes in the job config.
5. All the parameters disappear, instead "Build with parameters" there is a "Build now" button.