The `context()` function doesn't work for a list with a value with a custom context

[saig0]

Describe the bug The context() function doesn't work for a list value that contains a custom context. This is the case when the function is invoked in Camunda 8 with a process variable as the argument. See the details in the issue: https://github.com/camunda/camunda/issues/12740.

The function works fine if it is invoked with a list literal.

To Reproduce Steps to reproduce the behavior:

1. Add the following test to BuiltinContextFunctionsTest and run it
2. Verify that the test fails with the message: the evaluation didn't returned 'Map(a -> 1)' but 'null'

ScalaTest

it should "return a context with entries from a custom context" in {

    evaluateExpression(
      expression = """context(list)""",
      variables = Map(
        "list" -> List(
          ValContext(
            new MyCustomContext(
              Map(
                "key"   -> "a",
                "value" -> 1
              )
            )
          )
        )
      )
    ) should returnResult(Map("a" -> 1))
  }

Expected behavior I can invoke the context() function with a list that a custom context.

Environment

• FEEL engine version: 1.17
• Affects:
  • Camunda Automation Platform 7: [7.x]
  • Zeebe broker: https://github.com/camunda/camunda/issues/12740
  • Support case: https://jira.camunda.com/browse/SUPPORT-16886