Steps to reproduce:

Jenkins version 2.46.3

Pipeline-build-step: 2.60, 2.5.1

• Define a Parameterized Freestyle job. Set the parameters for that job properly, providing parameter description information.
• Run the job providing the needed values.
• Check the parameters information, you will see, parameter name, parameter value and description information.

If we create a pipeline job, that uses the BuildJob step to trigger the above-mentioned job, we will be able to execute the job successfully.

• Go again to the job and select the build triggered by the pipeline.
• Check the parameters information, in this case, the description for each parameter is set to null.