Proxied CNAME returns 404 for Cellular LTE network

We are seeing a strange behaviour for a proxied CNAME record. The POST requests fail with a 404 response (we are not sure which layer) is returning the 404 response since the request doesn’t come to our destination which is in AWS. The same CNAME works when posted from any WIFI network but not from a cellular network. Do you have any thoughts or directions on why it might happen?

An update: Turning off the proxy seems to resolve the issue. Looks like a bug in the CF proxy layer.

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