[Bug] Plan mode modifies files despite planning mode being enabled

Bug Description
was in plan mode but it changed the file either way

Environment Info

• Platform: darwin
• Terminal: kitty
• Version: 2.1.31
• Feedback ID: 3ca7be59-2136-42bb-9c46-315b1fa929e3

(keep in mind this session is old so the first error messages might not be relevant)
Errors

[{"error":"Error: 500 {\"type\":\"error\",\"error\":{\"type\":\"api_error\",\"message\":\"Internal server error\"},\"request_id\":\"req_011CXoMyJYrrJTTZrpAifF4D\"}\n    at generate (/$bunfs/root/claude:344:8942)\n    at makeRequest (/$bunfs/root/claude:361:5435)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-04T16:42:05.949Z"},{"error":"Error: 500 {\"type\":\"error\",\"error\":{\"type\":\"api_error\",\"message\":\"Internal server error\"},\"request_id\":\"req_011CXoMz83NKHU67mwqz9UpW\"}\n    at generate (/$bunfs/root/claude:344:8942)\n    at makeRequest (/$bunfs/root/claude:361:5435)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-04T16:42:16.208Z"},{"error":"SyntaxError: JSON Parse error: Unexpected identifier \"API\"\n    at <parse> (:0)\n    at parse (unknown)\n    at <anonymous> (/$bunfs/root/claude:70:855)\n    at A (/$bunfs/root/claude:11:7248)\n    at sX_ (/$bunfs/root/claude:761:91950)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-04T16:42:16.208Z"},{"error":"Error: Request was aborted.\n    at zJR (/$bunfs/root/claude:1551:23586)\n    at znB (/$bunfs/root/claude:5719:7546)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-04T18:44:01.157Z"}]