@@ -43,7 +43,7 @@ def core_execute_in_process(
             pipeline_def=pipeline_def,
             run_config=run_config,
             mode=mode_def.name,
-            tags=pipeline_def.tags,
+            tags={**pipeline_def.tags},
         )
 
         _execute_run_iterable = ExecuteRunWithPlanIterable(
from typing import Any, Dict, Optional

from dagster.core.definitions import NodeDefinition, PipelineDefinition
from dagster.core.definitions.pipeline_base import InMemoryPipeline
from dagster.core.execution.plan.outputs import StepOutputHandle
from dagster.core.instance import DagsterInstance

from .api import (
    ExecuteRunWithPlanIterable,
    create_execution_plan,
    ephemeral_instance_if_missing,
    pipeline_execution_iterator,
)
from .context_creation_pipeline import (
    PlanOrchestrationContextManager,
    orchestration_context_event_generator,
)
from .execute_in_process_result import ExecuteInProcessResult


def core_execute_in_process(
    node: NodeDefinition,
    run_config: Dict[str, Any],
    ephemeral_pipeline: PipelineDefinition,
    instance: Optional[DagsterInstance],
    output_capturing_enabled: bool,
    raise_on_error: bool,
):
    pipeline_def = ephemeral_pipeline
    mode_def = pipeline_def.get_mode_definition()
    pipeline = InMemoryPipeline(pipeline_def)

    execution_plan = create_execution_plan(
        pipeline,
        run_config=run_config,
        mode=mode_def.name,
    )

    output_capture: Dict[StepOutputHandle, Any] = {}

    with ephemeral_instance_if_missing(instance) as execute_instance:
        pipeline_run = execute_instance.create_run_for_pipeline(
            pipeline_def=pipeline_def,
            run_config=run_config,
            mode=mode_def.name,
            tags=pipeline_def.tags,
        )

        _execute_run_iterable = ExecuteRunWithPlanIterable(
            execution_plan=execution_plan,
            iterator=pipeline_execution_iterator,
            execution_context_manager=PlanOrchestrationContextManager(
                context_event_generator=orchestration_context_event_generator,
                pipeline=pipeline,
                execution_plan=execution_plan,
                pipeline_run=pipeline_run,
                instance=execute_instance,
                run_config=run_config,
                executor_defs=None,
                output_capture=output_capture if output_capturing_enabled else None,
                raise_on_error=raise_on_error,
            ),
        )
        event_list = list(_execute_run_iterable)

    return ExecuteInProcessResult(node, event_list, pipeline_run.run_id, output_capture)

pipeline_def.tags is `frozentags`