Anthropic prompt caching doesn't work

[s-h-a-d-o-w]

Before submitting your bug report

• [x] I believe this is a bug. I'll try to join the Continue Discord for questions
• [x] I'm not able to find an open issue that reports the same bug
• [x] I've seen the troubleshooting guide on the Continue Docs

Relevant environment info

- OS: Windows 11
- Continue version: 1.1.23
- IDE version: VSCode 1.99.2
- Model: Claude Sonnet 3.5
- config (truncated to what's relevant because my config is >100 lines):
  
  - name: claude-3-5
    provider: anthropic
    model: claude-3-5-sonnet-latest
    apiKey: ...
    cacheBehavior:
      cacheConversation: true
  
  OR link to assistant in Continue hub:

Description

I used the following prompt in Chat on serenade: @Codebase How do we get the information of what the language of the currently open editor in VS Code is?

See below for the resulting requests. (As far as I can see, you do one request for the code base context and then another one for the actual prompt. I don't know where the third request comes from.)

Do you maybe only use caching for the agent?

To reproduce

See description.

Log output