Architect Set Variable fails on ServiceNow JSON payload

Stuck on a payload transformation issue.

  • Genesys Cloud: v8.0
  • ServiceNow: Tokyo
  • Architect Flow: v2

The Set Variable action throws a JSON_PARSE_ERROR when constructing the body for the ServiceNow incident creation webhook. The input string contains nested arrays from the conversation log. Documentation suggests the variable type should be object, yet the flow crashes. Is there a size limit or schema restriction I am missing?