BunnyCDN sends two headers:
X-Forwarded-For
X-Real-IP
X-Forwarded-For contains the CDN IP, followed by the user IP. X-Real-IP forwards only the user IP.
You can customize IP headers to forward to your origin via edge rules, such as 'Add Request Header: X-New-IP: %{User.IP}' (variable expression details here: https://docs.bunny.net/docs/edge-rules-variable-expansion).