Thanks for reporting this. The developer was able to reproduce it. We have opened a Trouble Report for this bug which you can track here: https://www.nomachine.com/TR11K04052.
By toggling with the ‘Audio streaming’ slider, sound should come back.
Menu panel (Ctrl-Alt-0) -> Audio -> Change settings -> Move the Audio streaming slider.
You can put it back to the middle position. Click Done.