Can someone else confirm that the XAVC S Long-GOP render template drops the last audio frame? The Intra template works OK. Also, project markers are not saved in the rendered file.
It gets even worse. If your render duration has an Odd number of frames (as opposed to an even number), it will drop the last frame completely, both video and audio. Today, on a batch render of 98 events, I found that 15 of the rendered files were 1 frame shorter than the original event. In all cases, the number of frames for those events was an Odd number. Try it.