RayIds not always being unique

Hello, in the Cloudflare documentation about RayIds it is said that RayIds are not guaranteed to be unique for every request, see : https://developers.cloudflare.com/fundamentals/reference/cloudflare-ray-id/.
What would be the situations where different requests would have the same RayIds ?
Thanks in advance !

The ray ID is a short 8 byte hash of the request and colo information, not a globally unique ID or counter so the chances of generating duplicate results is non-negligible.

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