Why does a photo I deleted and removed permanently from trash still exist?

I took a photo on snapchat and saved it to my gallery. Post that, I've deleted the photo + permanently removed it from trash and I've deleted the Snapchat folder within my gallery too; however, when I open my whatsapp/telegram and browse through photos to change my profile picture, the folder still exists with only that single photo in it. Any idea how I can get rid of that photo? Thanks

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