-- Issue description (short summary) --

When using two flow variables with the OR operator inside $sys.func.IF(), an unexpected character error occurs at the position where OR starts. This happens even though both flow variables contain boolean values.

✅ Works:

"$sys.func.IF(true OR true, \"Valid\", \"Invalid\")"

"$sys.func.IF(true OR $flow.a, \"Valid\", \"Invalid\")"

❌ Fails:

"$sys.func.IF($flow.a OR $flow.a, \"Valid\", \"Invalid\")"

(Throws an unexpected character error at the position where OR starts.)

-- Steps to reproduce the issue (detailed description) --

Create a Dialogflow CX agent and define a boolean flow variable, $flow.a.
Set $flow.a = true.

Use the following condition inside an expression:

"$sys.func.IF($flow.a OR $flow.a, \"Valid\", \"Invalid\")"

Observe that it produces an error.

-- Expected behavior --

The expression should evaluate correctly and return "Valid" if $flow.a is true.
The OR operator should work consistently with both constants (true/false) and flow variables.

-- Actual behavior --

Unexpected character error occurs at the position where OR starts.
The system does not allow using two flow variables with OR, despite both being boolean.
This issue is inconsistent because using a mix of a constant (true) and a flow variable works fine.

-- Workarounds (if any) --

Using a constant (true OR $flow.a) works, but this is not useful for dynamic expressions.
Using separate conditions instead of OR may be required, but this is not ideal.

-- Documentation consulted --

Dialogflow CX Conditions Reference
The documentation states that OR should work with boolean values but does not mention any restrictions on flow variables.

-- Other information --

The issue appears to be a parsing bug when using two flow variables with OR.
Tested in different CX environments, and the behavior is consistent.

Issue 394381789

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