I'm running Magento ver. 2.3.5-p1. I have three stores running on one website
When I set a new from date in a specific store scope for a product, on save Magento updates all store scopes.
Bug or by design?
Check the scope of the
news_from_dateattribute by clicking on the Stores menu and selecting Attributes -> Product.
news_from_date attribute and under advanced attribute properties check the scope of the attribute
If it is set to global / website try setting it to store view.