[Bug] External editor file modifications trigger false "file modified" error blocking updates

Bug Description
Any time I open up a file in an external editor (e.g., RStudio or Notepad), I get an error that the file has been modified unexpectedly and so it must be read before it can bemodified. The only problem is even after reading the file, the update tool doesn't work and so I have to revert to createing a fresh version of the file, which wastes a ton of context.

Environment Info

• Platform: win32
• Terminal: null
• Version: 2.0.55
• Feedback ID:

Errors

[{"error":"Error\n    at gq (B:/~BUN/root/claude.exe:27:1143)\n    at <anonymous> (B:/~BUN/root/claude.exe:32:10086)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (B:/~BUN/root/claude.exe:34:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T03:50:34.823Z"},{"error":"Error\n    at gq (B:/~BUN/root/claude.exe:27:1143)\n    at <anonymous> (B:/~BUN/root/claude.exe:32:10086)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (B:/~BUN/root/claude.exe:34:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T03:50:34.825Z"},{"error":"Error\n    at gq (B:/~BUN/root/claude.exe:27:1143)\n    at <anonymous> (B:/~BUN/root/claude.exe:32:10086)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (B:/~BUN/root/claude.exe:34:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T03:50:35.238Z"},{"error":"Error: String not found in file. Failed to apply edit.\n    at UTH (B:/~BUN/root/claude.exe:1674:731)\n    at I8$ (B:/~BUN/root/claude.exe:1674:107)\n    at p6D (B:/~BUN/root/claude.exe:2100:1626)\n    at WSD (B:/~BUN/root/claude.exe:2713:2033)\n    at j9 (B:/~BUN/root/claude.exe:712:19666)\n    at b4 (B:/~BUN/root/claude.exe:714:42843)\n    at Pq (B:/~BUN/root/claude.exe:714:38376)\n    at Gf (B:/~BUN/root/claude.exe:714:38304)\n    at s3 (B:/~BUN/root/claude.exe:714:38158)\n    at Uq (B:/~BUN/root/claude.exe:714:35233)","timestamp":"2025-11-29T03:50:45.818Z"},{"error":"Error: String not found in file. Failed to apply edit.\n    at UTH (B:/~BUN/root/claude.exe:1674:731)\n    at I8$ (B:/~BUN/root/claude.exe:1674:107)\n    at p6D (B:/~BUN/root/claude.exe:2100:1626)\n    at WSD (B:/~BUN/root/claude.exe:2713:2033)\n    at j9 (B:/~BUN/root/claude.exe:712:19666)\n    at b4 (B:/~BUN/root/claude.exe:714:42843)\n    at Pq (B:/~BUN/root/claude.exe:714:38376)\n    at Gf (B:/~BUN/root/claude.exe:714:38304)\n    at s3 (B:/~BUN/root/claude.exe:714:38158)\n    at Uq (B:/~BUN/root/claude.exe:714:35233)","timestamp":"2025-11-29T03:50:45.948Z"},{"error":"Error\n    at gq (B:/~BUN/root/claude.exe:27:1143)\n    at <anonymous> (B:/~BUN/root/claude.exe:32:10086)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (B:/~BUN/root/claude.exe:34:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T03:55:35.283Z"},{"error":"Error: File has been unexpectedly modified. Read it again before attempting to write it.\n    at call (B:/~BUN/root/claude.exe:2106:769)\n    at async d$9 (B:/~BUN/root/claude.exe:2226:16728)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T03:57:04.708Z"},{"error":"Error: File has been unexpectedly modified. Read it again before attempting to write it.\n    at call (B:/~BUN/root/claude.exe:2106:769)\n    at async d$9 (B:/~BUN/root/claude.exe:2226:16728)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T03:57:19.103Z"},{"error":"Error\n    at gq (B:/~BUN/root/claude.exe:27:1143)\n    at <anonymous> (B:/~BUN/root/claude.exe:32:10086)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (B:/~BUN/root/claude.exe:34:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T04:00:35.264Z"},{"error":"Error\n    at gq (B:/~BUN/root/claude.exe:27:1143)\n    at <anonymous> (B:/~BUN/root/claude.exe:32:10086)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (B:/~BUN/root/claude.exe:34:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-11-29T04:05:35.240Z"},{"error":"Error\n    at gq (B:/~BUN/root/claude.exe:27:1143)\n    at <an

Note: Error logs were truncated.