This root form (lemma) is used in 2 different forms in the NT: ἀναγεγεννημένοι (PEP·NMP), ἀναγεννήσας (PAA·NMS).
It is glossed in 2 different ways: ‘having born_again’, ‘having_been born_again’.
OET 1PET 1:3 Greek word=ἀναγεννήσας (anagennaʸsas) Morphology=PAA·NMS English gloss=‘having born_again’ SR GNT 1PET 1:3 word 18
OET 1PET 1:23 Greek word=ἀναγεγεννημένοι (anagegennaʸmenoi) Morphology=PEP·NMP English gloss=‘having_been born_again’ SR GNT 1PET 1:23 word 2