Rate Limiting when Cloudflare is the proxy

We have two Cloudflare zones (sites): example-a.com and example-b.com. We have a worker configured in a to forward some requests to b. If I enable Rate Limiting in b, it sees all requests as coming from Cloudflare:

I have enabled “Support users behind NAT” on the rate-limiting rule.

Is there any way I can get the a and b zones to agree on a client IP? The True-Client-IP header is enabled in both zones.

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