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Bug Report: Prompt caching not applied for single system message and streaming ignores cache tokens

Bug Report: Prompt caching not applied for single system message and streaming ignores cache tokens: a task in LegoFlow-SWE (Harbor dataset). Create a client and a chat request with one system message and a cache control (the message body must exceed the minimum cacheable size for the used model):

The task

Create a client and a chat request with one system message and a cache control (the message body must exceed the minimum cacheable size for the used model):

Part of Lego-X/LegoFlow-SWE.