Starting from version 1.41.0.Final recursive data types used in bpmn models end up in endless loops. With version 1.40.1.Final those data types work fine.

Simplified example to reproduce the issue:

• RecursiveDataType-1.java
• test-1.bpmn2

We faced endless loops for our recursive data type in 

• DevMode: http://localhost:8080/q/dev/org.kie.kogito.runtime-tools-quarkus-extension/processInstances -> Process Definitions -> Start new process
  • version 1.41.0.Final  
    
  • version 1.40.1.Final
    
• Task Console (with generated ui from schema with recursive data type) while adding a new sub item
  • Start process instance via swagger ui

{   "in_1": {     "stringValue": "string",     "subStrings": [    ]   } } 

• • Open task and add sub string
    

• kogito-data-index with infinispan persistence: StackOverflowException reading the proto file with recursive data type