I think I am currently running into this same issue, attempting to set the refspec and branch values from job parameters does not work because parameters are not interpreted at cpsScm checkout time.

Are you using jenkins which version ?
jenkins 1.6 version is working without any scripting parameterized.
select your job configuration this build is parameterized — select string parameter---give only name---you are not enter default value.
you pass the parameter another job. Goto second job build---- addbuild step----execute windowbatch command
call the variable here $name.
when u run your first job asking buildwith parameter--click-and write your valuethen build--
its automatically come to variable value in another job

This issue is not related to EnvIject plugin - this plugin does not support Pipeline at all

Thanks, that makes sense. In that case this ticket can be closed.

Is there a way to do something similar with Pipeline, then? I.e. click Build With Parameters, enter the name of a branch, and have pipeline checkout that branch and run the jenkinsfile in it?

crummy By now I see no evidence you use EnvInject. From what I see you just use Job Parameter (core feature) which does something with Pipeline settings (Pipeline Job plugin). Please correct me if I'm wrong.

P.S: BTW, maybe your case can be solved with Pipeline Multi-Branch plugin instead of a common Pipeline

Can you provide a reproduction case? If not, I'm going to close this as cannot reproduce.