I was able to get the correct/better results with additional config show below with ' -z"-config ".
sh 'zap-full-scan.py -i -I -a -j -t
https://example.com -x zapreport.xml -r zapreport.html -z "-config scanner.addQueryParam=true -config scanner.antiCSRF=true -config scanner.attackPrompt=true -config scanner.attackRescan=true -config scanner.scanNullJsonValues=true -config scanner.injectable=31 -config scanner.enabledRPC=191 -config scanner.advDialog=false -config scanner.scanHeadersAllRequests=true "'