[Bug] Prompt caching consuming usage limits faster than expected

Bug Description
I think the [ bug with prompt caching that caused usage limits to be consumed faster than normal. ] issue is back. Seeing very fast usage suddenly with minor-to-mild use.

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.1.63
• Feedback ID: 5d1688ed-9e97-4fda-a083-eb700535adb0

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/ryan/.local/share/claude/versions/2.1.63 (expected in multi-process scenarios)\n    at sVR (/$bunfs/root/claude:2436:2100)\n    at QjA (/$bunfs/root/claude:2436:1211)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:23.192Z"},{"error":"Error: Plugin document-skills has an invalid manifest file at /Users/ryan/.claude/plugins/cache/anthropic-agent-skills/document-skills/00756142ab04/.claude-plugin/plugin.json.\n\nValidation errors: : Unrecognized keys: \"source\", \"strict\"\n\nPlease fix the manifest or remove it. The plugin cannot load with an invalid manifest.\n    at VZR (/$bunfs/root/claude:1924:11714)\n    at async g0B (/$bunfs/root/claude:1932:378)\n    at async _p7 (/$bunfs/root/claude:1932:9075)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:23.224Z"},{"error":"Error: Plugin vercel has an invalid manifest file at /Users/ryan/.claude/plugins/cache/claude-plugins-official/vercel/1.0.0/.claude-plugin/plugin.json.\n\nValidation errors: : Unrecognized keys: \"category\", \"source\"\n\nPlease fix the manifest or remove it. The plugin cannot load with an invalid manifest.\n    at VZR (/$bunfs/root/claude:1924:11714)\n    at async g0B (/$bunfs/root/claude:1932:378)\n    at async _p7 (/$bunfs/root/claude:1932:9075)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:23.224Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at uhT (/$bunfs/root/claude:1792:15724)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:23.233Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server greptile invalid: Missing environment variables: GREPTILE_API_KEY\n    at uhT (/$bunfs/root/claude:1792:15724)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:23.233Z"},{"error":"Error: LSP server plugin:typescript-lsp:typescript failed to start: Executable not found in $PATH: \"typescript-language-server\"\n    at start (/$bunfs/root/claude:2716:22317)\n    at async H (/$bunfs/root/claude:2716:24629)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:24.473Z"},{"error":"Error: Executable not found in $PATH: \"typescript-language-server\"\n    at spawn (unknown)\n    at spawn (node:child_process:667:35)\n    at spawn (node:child_process:14:39)\n    at start (/$bunfs/root/claude:2716:20843)\n    at H (/$bunfs/root/claude:2716:24629)\n    at _ (/$bunfs/root/claude:2716:32738)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:24.473Z"},{"error":"Error: Failed to start LSP server plugin:typescript-lsp:typescript: Executable not found in $PATH: \"typescript-language-server\"\n    at <anonymous> (/$bunfs/root/claude:2716:32760)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:24.473Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at uhT (/$bunfs/root/claude:1792:15724)\n    at async E (/$bunfs/root/claude:4109:14710)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:24.473Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server greptile invalid: Missing environment variables: GREPTILE_API_KEY\n    at uhT (/$bunfs/root/claude:1792:15724)\n    at async E (/$bunfs/root/claude:4109:14710)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:24.473Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at uhT (/$bunfs/root/claude:1792:15724)\n    at async X (/$bunfs/root/claude:4109:14177)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:24.474Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server greptile invalid: Missing environment variables: GREPTILE_API_KEY\n    at uhT (/$bunfs/root/claude:1792:15724)\n    at async X (/$bunfs/root/claude:4109:14177)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-02T14:00:24.474Z"},{"error":"Error: 1P event logging: 5 events failed to export (request-id=req_011CYeNgmyCdoMmhJQJMzgmE, status=500, code=ERR_BAD_RESPONSE, Request failed with status code 500)\n    at queueFail…

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