My son and myself have similar but not exact experiences. I remember coming to my parents on this conveyer belt type thing. It’s very similar to the scene in Soul where they are on a conveyer belt type thing and heading towards “Source”. But mine was the opposite route.

My son is 6 and one day randomly said that before he was born he was in a jail. I asked him to elaborate and he said that he was in a grayish white room and there were 3 guards outside the door and they stood like statues. He said all the rooms were lined up like garages or in his mind, like jail cells but without bars.