an exception which occurred:
	in field com.cloudbees.groovy.cps.impl.BlockScopeEnv.locals
	in object com.cloudbees.groovy.cps.impl.BlockScopeEnv@53ce7f91
...
Caused: java.io.NotSerializableException: java.util.regex.Matcher
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:926)
...

import com.cloudbees.groovy.cps.NonCPS

//Fails when it enters this method, only if method is annotated NonCPS
@NonCPS
def getMessage(def auth) {
    return '[abc][def]asdasd'
}

def getTags() {
//Below line is the offending code, it seems to break CPS rules, but it only fails intermittently
    def tagMatches = getMessage(credentials) =~ /\[(.*?)\]/
    def tagsList = []
    for (def tagMatch in tagMatches) {
        tagsList << (tagMatch[1])?.toLowerCase()
    }
    tagsList
}

//This doesn't seem as though it would be relevant, but if I remove it when reproducing the failure doesn't seem to appear, perhaps it causes some necessary delay that causes serialisation in the parallel run?
def getCredentials() {
    withCredentials([
            [$class: 'StringBinding', credentialsId: 'SOME_CREDENTIALS', variable: 'TOKEN']
    ])
            {
                "any"
            }
}

def script = {
    stage(it) {
        println tags
    }
}

def scripts = [:]

for (int i = 0; i < 5; i++) {
    def runName = "run ${i}"
    scripts."run ${i}" = { script(runName) }
}

//Running the scripts sequentially does not cause issue
 for ( def _script:scripts.values()){
     _script()
 }
//Running the scripts in parallel causes the issue
parallel scripts