Reason for Draft entitlement disappearance
Reason for Draft entitlement disappearance could be
No Line items being present under the specified entitlement.
View Entitlements -> Line Items -> orders will be listed here if present .
Add Line items to the entitlements ( Edit this entitlement -> Under Line Items -> Add Catalog Item ID -> Save) , so that entitlement is present even if the entitlement is moved to draft state.