If the photos go to a private directory but you are now rooted you should be able to directly access that directory and copy the files out. This is assuming that they are stored as regular files in that directory instead of being solely in the sqlite db. Does that work?
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I can but then the photos are gonna be duplicates which would take up a lot of space
Why don't you just move the photos back?
Then I can't see them in the chat since they're in a different location.
WhatsApp expects to see your images in the images folder. Move the photos into that and they should be picked up. The folder should be
Android/media/com.whatsapp/WhatsApp/Media/WhatsApp Images/
The private folder is a subfolder of WhatsApp Images, so you should just need to move them up one level.