[Bug] Claude Code: Persistent Instruction Disregard and Output Quality Degradation

Bug Description
Something is not right. I have used Claude code for quite some time and I need you to know this is different in the latest updates of Claude Code. I can go to Cursor and it works fine but if I go to Claude code my quality decreases in output for one reason it literally ignores what I tell it. I will give it exact file paths and say it exists and say no this exists please stop trying to make files that exist and continue with the rest of the work like in this convo. then it will ignore my demands until I get very very aggressive and start cussing at it. I have to bully the model in Claude code into just listening to me sometimes resorting to threats. this is a common method I used in end of 2024. I saw that you guys found a known issue or a handful of them that caused output quality reduction. once you fixed this the day I upgraded to the latest claude code version this started to happen. I use Claude code alot and I would never come to you with this unless I was certain. Something is critically wrong with Claude code

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 1.0.120
• Feedback ID: fa462473-a581-4bb5-8cf1-fd8697143392

Errors

[{"error":"Error: String not found in file. Failed to apply edit.\n    at JO (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1837:728)\n    at Object.call (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1903:3297)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async VJ5 (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:3350:21057)\n    at async WNB (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:3350:17339)\n    at async XJ5 (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:3350:16202)\n    at async WJ5 (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:3350:15739)\n    at async lO (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:3350:12754)\n    at async lO (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:3350:13667)\n    at async lO (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:3350:13667)","timestamp":"2025-09-23T04:10:33.767Z"},{"error":"Error: Request was aborted.\n    at y51._createMessage (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1000:7955)\n    at processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at runNextTicks (node:internal/process/task_queues:69:3)\n    at listOnTimeout (node:internal/timers:569:9)\n    at process.processTimers (node:internal/timers:543:7)","timestamp":"2025-09-23T04:14:58.577Z"},{"error":"Error: Request was aborted.\n    at IP.makeRequest (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1009:3864)\n    at processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at runNextTicks (node:internal/process/task_queues:69:3)\n    at listOnTimeout (node:internal/timers:569:9)\n    at process.processTimers (node:internal/timers:543:7)","timestamp":"2025-09-23T04:18:52.494Z"},{"error":"Error: Request was aborted.\n    at y51._createMessage (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1000:7955)\n    at processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at runNextTicks (node:internal/process/task_queues:69:3)\n    at process.processTimers (node:internal/timers:540:9)","timestamp":"2025-09-23T04:19:43.807Z"},{"error":"Error: Request was aborted.\n    at y51._createMessage (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1000:7955)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)","timestamp":"2025-09-23T04:20:38.631Z"},{"error":"Error: Request was aborted.\n    at IP.makeRequest (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1009:3864)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)","timestamp":"2025-09-23T04:24:44.978Z"},{"error":"Error: Request was aborted.\n    at y51._createMessage (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1000:7955)\n    at processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at runNextTicks (node:internal/process/task_queues:69:3)\n    at process.processTimers (node:internal/timers:540:9)","timestamp":"2025-09-23T04:25:15.916Z"},{"error":"Error: Request was aborted.\n    at y51._createMessage (file:///C:/Users/Matt-PC/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1000:7955)\n    at process.processTicksAndRejections (node:intern

Note: Error logs were truncated.