Now when I export to Excel, I no longer see the option to export task details. This caused some friction because I had set up all my tasks to depend on that export column.
Very likely you have set a grouping that makes exporting task details unavailable. Also covered in the FAQ.
I find this probably an unwanted change made it to the release. When you export to the Excel sheet, you'll get the "Task details" renamed as "Tags". Please don't change these names since we use pivot tables and queries to analyze those exported data.
Can you please share a screenshot with your export settings so I can reproduce (and fix) this error?