Just got the new Creative BT-W4 Bluetooth 5.2 Audio Transmitter with aptX Adaptive.
Finally found a BT 5.2 transmitter that works just fine - with my B&O EX it sounds just great.
Not cheap 54,99€ - but it works just SUPER. There many BT 5.2 transmitter that claim they are aptX Adaptive - but they are not. So watch out 
PS: Disclaimer - I have nothing to do with the company