Failed to migrate from 15.x to 16.0

I am trying to migrate the xwiki instance to another server, the current version is 15.x and the xwiki version on the target server is 16.x.

I used the export function to get the 15.x xar file, Export content All the content was selected, and 95% of the content was stuck when importing to 16.x

image

Does my operation conform to the specification?