Steps to reproduce : inject env var using 'envInject' plugin with content :
(check on screenshot)
Then call this var in a step 'execute shell script', you'll see that \ char has been dropped.
This is a regression in this version : rollback to 1.92.1 restores the right behavior.
Could be caused by resolution of : https://issues.jenkins-ci.org/browse/JENKINS-31573 ?