Using CTE to find recursive records failed - sql

Question

I write a CTE in the procedure that to find the recursive records. If works fine before, but suddenly it stops working when I try to run it again. Here is what two table structure looks like:
Here is my code:
DELETE FROM [dbo].[NVA_Work_Rollup_BOM_Materials]
WHERE Product_Item_No = Ingredient_Item_No;
IF OBJECT_ID(N'tempdb..#temp', N'U') IS NOT NULL
DROP TABLE #temp
CREATE TABLE #temp (Product nvarchar(32),
Ingredient nvarchar(32),
Trail nvarchar(max),
Loopcheck BIT
)
TRUNCATE TABLE #temp
DECLARE #False AS BIT,
#True AS BIT
SET #False = 0
SET #True = 1;
WITH C
as (
select
Product_Item_No,
Ingredient_Item_No,
CAST(('|' + Product_Item_No + '|') as nvarchar(max)) as Trail,
#False as LP
from NVA_Work_Rollup_BOM_Materials
where
Product_Item_No in (select Item_No from NVA_Work_Rollup_Level_Codes where Level_Code = 0 and Rpt_Period = #P_CurrentPeriod)
AND Rpt_Period = #P_CurrentPeriod
union all
select
Matl.Product_Item_No,
Matl.Ingredient_Item_No,
CAST((Trail + (Matl.Product_Item_No +'|')) as nvarchar(max)),
case
when Trail like '%|' + CAST((Matl.Ingredient_Item_No) as nvarchar(max)) + '|%'
then #True
else #False
end as LP
from NVA_Work_Rollup_BOM_Materials as Matl
inner join C
on C.Ingredient_Item_No = Matl.Product_Item_No
where C.LP = 0
and Matl.Rpt_Period = #P_CurrentPeriod
)
INSERT INTO #temp
SELECT * FROM C
WHERE LP = 1
OPTION (maxrecursion 0)
The procedure stuck on there and won't populate the #temp table. I did execution plan check, and the only thing i could see is the eager spool. Any help will be appreciate, also how should i debug here.