Hello Andrey,
I’ve sent sample images to support email. Let me know if you received it or use this link to dropbox
https://www.dropbox.com/t/DKtdeOewlnfLFRmb
Basically you can detect panoramas by EXIF tags.
Most 360 panoramas have:
GPano: ProjectionType equirectangular
Also 360 degree panoramas always have 2:1 W:H ratio