Board Thread:Theories and Speculation/@comment-44437908-20200507033747/@comment-32685487-20200508194629

The chakra also seems to be copied into the next Incarnate as Hagoromo was able to appear thanks to Madara and Hashirama in the 4th War(Madara was brought back to life and his body had Hashirama's DNA and chakra in it thanks to the Hashi face Kabuto put on his chest, meaning they still had the reincarnate chakras), and speak to Hashirama and the other Kage present. Once you have the reincarnate chakra you always have the chakra apparently.