Android app wouldn't marked duplicate photos as backed up in backup status

Hi, I finally self-hosted a instance on my TrueNAS today and successfully imported photos from my old local backup.

After imported from local backup, I installed app on my Android and setup foreground sync from my DCIM folder.

The question is, while foreground sync was running, it doesn't marked same photos as backup. Looks like it silently skip and add assets to the duplicated blacklist. Shouldn't it mark these photos as backup correctly already?
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