Some pages give the code 304 and do not receive the subsequent 200th

Good afternoon. According to the project shpion.su, some pages give the code 304 and do not receive the subsequent 200th. Help me figure out what could be the reason.

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Why then does the cache give nothing and the page is blank?

Because the client is sending the wrong request? Because the origin server is misconfigured?

Do you have a specific example URI for a resource returning the response?