[Bug] File read fails after conversation rewind with "unchanged" status

Bug Description
When a file is read, then the conversation rewinds, the file can no longer be read. (It is reported as "unchanged" and the contents are not given to Claude.) Claude has to resort to using Bash(cat) to read it.

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.121
• Feedback ID: c694b4d3-75f1-4894-9638-7a24bd6a94ad

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/rmbutler/.local/share/claude/versions/2.1.121 (expected in multi-process scenarios)\n    at p66 (/$bunfs/root/src/entrypoints/cli.js:2769:2177)\n    at YY8 (/$bunfs/root/src/entrypoints/cli.js:2769:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-28T20:55:56.814Z"},{"error":"MaxFileReadTokenExceededError: File content (78881 tokens) exceeds maximum allowed tokens (25000). Use offset and limit parameters to read specific portions of the file, or search for specific content instead of reading the whole file.\n    at nx7 (/$bunfs/root/src/entrypoints/cli.js:4850:12789)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-28T20:57:42.172Z"},{"error":"Error: Request was aborted.\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:3448)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-28T20:58:13.817Z"},{"error":"Error: Request was aborted.\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:3448)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-28T20:58:40.235Z"}]