@henrikfritzonsund A race condition is likely occurring, and I suspect your capture might be long enough such that data is being exported before all data has been processed for decoding. In other words, the data table is likely not yet ready to be exported. This is likely our fault (we should provide a means to block execution until analyzer processing has been completed).
Can you try adding a short delay before exporting your data to see if that helps?
For an example, the user below ran into the same issue and a 250 ms delay before exporting helped.