The document at
https://access.redhat.com/documentation/en-us/red_hat_codeready_studio_integration_stack/12.11/html-single/12.11.0_release_notes_and_known_issues/index#bpmn2_1_5_1_final_2

contains the following items

• Bug 501229: Default 'Skippable' is not generated for imported processes
• RHBPMS-283: By JBDS community version name is used for a jbpm.version variable in jBPM project's pom.xml file
• RHBPMS-1536: Process is deformed when special characters are used
• RHBPMS-1928: service task workitemhandler node parsing error in JBDS
• RHBPMS-4102: Constant assignment can not be used for service task input parameter
• RHBPMS-4342: Missing data type for Error Definition
• Bug 1321332: BPMN2 Modeler: unable to input more than 255 characters in text area
• Bug 1324041: Missing 'Is Async' property for script tasks
• Bug 1190688: Intermediate Link events paired N to 1
• Bug 501229: Default 'Skippable' is not generated for imported

Please notice that the firt item and the last one is the same.