When a Google Sheets automation script encounters unexpected data format changes and fails troubleshooting, involves a few steps. Firstly, understand the error by carefully examining the error messages and logs provided by the Apps Script. Second, debug the script by using the Apps Script debugger to step through the code and inspect variables. Third, analyze the data in the spreadsheet by checking the cell values, formatting and overall structure of the affected data. Fourth, implement error handling to gracefully manage unexpected data formats and prevent script failures. And finally, verify the script's assumptions about the data format against the actual data in the spreadsheet. There are more detailed breakdown of the troubleshooting process in which first of all understanding the errors, error messages, logs, error handling, second debugging the script, third analyzing the date, fourth implementing error handling, fifth verifying all the assumptions included.
