If bytecode-enhancement is disabled, the lazy field with OneToOne association is not resolved. However if bytecode-enhancement is enabled, the lazy field is resolved(hibernate sends an additional sql statment to fetched the associated object).

The configuration of hibernate-enhance-maven-plugin is below

<configuration>
    <failOnError>true</failOnError>
    <enableLazyInitialization>true</enableLazyInitialization>
    <enableAssociationManagement>false</enableAssociationManagement>
    <enableDirtyTracking>false</enableDirtyTracking>
    <enableExtendedEnhancement>false</enableExtendedEnhancement>
</configuration>

test case project with db ddl is attached. Please run JPAUnitTestCase to reproduce this issue.