I am also affected by this issue: I would like to use my Jabra ENVOLVE 65 headset with A2DP for the headphones in combination with the microphone of the headset at the same time. Hope that A2DP (for the headphones) and HSP/HFP (for the microphone) can be used simultaneously via Bluetooth and that someone finds out how and that someone fixes this. While this is not fixed I can not use my headset for voip calls under Ubuntu (18.04) (HSP/HFP quality is too poor for a multiple-hour call).
I am also affected by this issue: I would like to use my Jabra ENVOLVE 65 headset with A2DP for the headphones in combination with the microphone of the headset at the same time. Hope that A2DP (for the headphones) and HSP/HFP (for the microphone) can be used simultaneously via Bluetooth and that someone finds out how and that someone fixes this. While this is not fixed I can not use my headset for voip calls under Ubuntu (18.04) (HSP/HFP quality is too poor for a multiple-hour call).