we have used  sling:resourceType="granite/ui/components/foundation/form/multifield" in aem 6.4. Nodes are created like below and its working fine. we used podComponent inside podsContainer component dialog.

podsContainer

             |

            pods

                 |

                 0

                  |

                 assetPod

but when we chaged sling:resourceType="granite/ui/components/coral/foundation/form/multifield" in aem 6.5. Nodes needs to be created in below format. but data is resetting for every dialog submission.

podsContainer

             |

            pods

                 |

                items0

                  |

                 assetPod (not creating)