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Import script does not restore item's list security


When I use the script 'Export-All-SPWeb-Lists' to export a list that has each item with its own security permissions, and when I restore the list using the script 'Export-Import-SharePoint-List', then the security on each items is not restored.
I have tried to restore the list using the classical Import-SPWeb command let but it did not restore secutiry item.
The list I want to back up and restore is a bit special because each item a unique security.
I have tried to restore within the same site collection and within a differetn site collection: same problem.
I would like to use the script 'Export-All-SPWeb-Lists' to backup all my list because it is a very powerful script (thanks!).
But how can I restore my lists with its item's security ?