[Bug] /compact fails with "Conversation too long" error despite low context usage

Bug Description
I notice that /compact gives me  Error: Error during compaction: Error: Conversation too long. Press esc twice to go up a few messages and try again.
when the context is below 10%

Environment Info

• Platform: darwin
• Terminal: kitty
• Version: 2.0.5
• Feedback ID: 6ad43f8b-2c93-4eec-9212-3af2d537456c

Errors

[{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at QK (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:1183)\n    at file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:911\n    at Array.map (<anonymous>)\n    at xX (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:902)\n    at oFB (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3174:12895)\n    at CC (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:34:19415)\n    at Cy (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:3227)\n    at Fp (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:43595)\n    at I9 (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38355)\n    at Ch (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38283)","timestamp":"2025-10-07T07:59:04.929Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at QK (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:1183)\n    at file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:911\n    at Array.map (<anonymous>)\n    at xX (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:902)\n    at oFB (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3174:12895)\n    at CC (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:34:19415)\n    at Cy (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:3227)\n    at Fp (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:43595)\n    at I9 (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38355)\n    at Ch (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38283)","timestamp":"2025-10-07T07:59:04.929Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at QK (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:1183)\n    at file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:911\n    at Array.map (<anonymous>)\n    at xX (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:902)\n    at Object.p5B [as renderToolResultMessage] (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1857:760)\n    at vJB (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:2847:1958)\n    at CC (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:34:19415)\n    at Fp (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:42814)\n    at I9 (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38355)\n    at Ch (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38283)","timestamp":"2025-10-07T08:04:28.302Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at QK (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:1183)\n    at file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:911\n    at Array.map (<anonymous>)\n    at xX (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:902)\n    at Object.p5B [as renderToolResultMessage] (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1857:760)\n    at vJB (file:///Users/ckyony/.asdf/installs/nodejs/22.12.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:2847:1958)\n    at CC (file://

Note: Error logs were truncated.