Forecast Spreading in ASCP

Problem Statement
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Forecast from Demantra for Jun = 1000
In ASCP horizontal plan, the forecast for Jun is only spread for 4 weeks @ 250 per week and 0 forecast for last week
But Jun has 5 weeks (4-4-5 calendar setup for Mfg calendar at org level)

Expectation
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In ASCP horizontal plan, the forecast for Jun is only spread for 5 weeks @ 200 per week.

Setups
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1. We receive Demantra forecast in Monthly buckets.
2. in ASCP unconstraint plan options, Spread forecast evenly = Yes ; consume by forecast bucket = Yes, Explode forecast = Yes; Include sales order = Yes for planning org.


Question
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is there a setup that may be missing?

Notes on Metalink