You do not only have to bypass the jb detection, but also disable tweak injection (Substrate).
1. Go to Cydia, add this Repo: https://chr0nict.github.io/Nepeta-Mirror/
2. Go to search, and search: UnSub
3. Install it and Respring
4. Then go to Settings and look for UnSub
5. Toggle on Snapchat for:
-Disable tweak injection in apps
-Bypass jailbreak detection
6. Respring again
7. Go to Snapchat and you should be able to use it normally
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AideNx's post in Snapchat ban with unc0ver was marked as the answer