Problem finding @type in Extensible

[MichalLaczynskiAmartus]

While blending Aretha Legato - an error is raised:

10:30:10.958 [pool-2-thread-2] ERROR c.a.sonata.blender.cmd.AbstractBlend - No discriminator defined for MefServiceConfiguration
10:30:10.959 [pool-2-thread-2] WARN c.a.b.s.blender.BlendingService - Blending failed for 702b5675-6bfb-48d7-adf0-867cb409d5ed
java.lang.IllegalStateException: Discriminator not found
at com.amartus.sonata.blender.impl.MergeSchemasAction.execute(MergeSchemasAction.java:66)

aretha\MEF-LSO-Legato-SDK-aretha\api\legato\serviceProvisioning\serviceOrdering\v4\serviceOrderingApi.openapi.yaml
The the MefServiceConfiguration extend Extensible where the @type is.
Manual move of @type to MefServiceCOnfig helped, but this cannot be done on published APIs

[MichalLaczynskiAmartus]

Tested OK