Assigning default value for Ref type in a schema can cause sideeffects

[rkdrnf]

Assigning a default value for a Ref type can cause side effect when a user modifies the value of the property later.

If a user does not assign explicit default values for component properties when adding a new component to the entity, Ref type properties get assigned the default value of the defined schema, which makes modifying ref value later causes default value itself to be changed.