On freestyle job build page, wen can easily display all "environment variables" sorted alphabetically, thanks to a link on the left menu.
This is no more available for a build on a pipeline job.
Could it be possible to have the same link that could display an array of the overall build common variables, and one array per stage showing variables that are new or have changed for each slave.
And perhaps also a link within the pipeline stage view for each line where it is relevant (probably stage start and steps.