The very rare wasp Agenioideus sericeus  aparently is still active in the garden. She looks very similar to Auplopus carbonarius but that species is somewhat bigger which was what triggered me while I was waiting for an Ancisterocerus wasp to sit.
It is a nervous wasp that flaps her wings during her fast pace. But it is good to know she is here, next time hopefully produces some nicer pictures.
References1 Nederlands Soortenregister