fix(api): Fix incorrect handling of `Variable` types in `VariablePool`

api/core/variables/segments.py

@@ -1,11 +1,12 @@
 import json
+import sys
 from collections.abc import Mapping, Sequence
 from typing import Any
 
-import sys
 from pydantic import BaseModel, ConfigDict, field_validator
 
 from core.file import File
+
 from .types import SegmentType
 
 

api/core/workflow/entities/variable_pool.py

@@ -96,7 +96,7 @@ class VariablePool(BaseModel):
 
         if isinstance(value, Variable):
             variable = value
-        if isinstance(value, Segment):
+        elif isinstance(value, Segment):
             variable = variable_factory.segment_to_variable(segment=value, selector=selector)
         else:
             segment = variable_factory.build_segment(value)