When using declarative pipelines, and defining environment variables to be multi line strings using triple quotes ('''), since 1.1.1, the pipeline fails to parse.

Example input:

https://gist.github.com/khobbits/e60a0b086fd73e6ea8ef64175dce0ab1

Stack trace & error:

https://gist.github.com/khobbits/8d7f0851fd3410d3369aacea1f896ad7

Error Extract:

hudson.remoting.ProxyException: org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Script8.groovy: 1: expecting anything but ''\n''; got it anyway @ line 1, column 14.
"STACK_INFO={

Possibly related to JENKINS-42771