Cloudflare's proxy mode DNS has strange problem with Synology's share link

I found a very strange problem when using Synology’s shared link. I suspect it is related to cloudflare’s cache, but I really can’t solve it.

I have a domain name, here example.com, I set up two DNS records, a.example.com and b.example.com, I set the record values of a.example.com and b.example.com to be my The address of the Synology device, but a.example.com uses DNS only, but b.example.com uses Proxy

In the above scenario, I shared a file on Synology and got a sharing link /sharing/abc. I found that when I used b.example.com/sharing/abc, I could not download the file normally, but instead received a 404 , while using a.example.com/sharing/abc is completely fine

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