Forecast not getting considered when forecast date is before plan start date

Hi Team,

We have an scenario and we need your help.

# Forecast loaded on 17th Jun 2021.

# First forecast period is '01-JUN-2021' and then '01-JUL-2021' and so on.

# Collection plan has captured the forecast from '01-JUN-2021'.

# But Planning engine didn't consider Jun-21 forecast at all. The first forecast it considered in Jul-21.

# Does planning engine drops the forecast if the forecast date is before plan start date ? Or it should at least spread it for last 2 weeks of Jun-21 (Expected) ?

# Is there any profile that controls it ?

I have verified all the setups and all looks good. Also reviewed the preference in planning workbench.