Indesign 21.2
Exporting a 30 page complex file, the sort which occasionally give us problems. The export ends with no crash, and no alert in Background Tasks, but a zero K PDF file.
In previous versions Indesign would crash. Which was only better in that you knew immediately there was a problem.
The complexity in our file is that it is a summary with many other indesign files placed into it.
Our workaround (exporting single pages then compiling) usually works if it is done in 2 or 3 chunks.