Question about Ugreen CM403

I use this adapter in the car as a receiver for my iPhones. Everything has worked perfectly so far. Now I have had to change my iPhone because the old one is no longer supported by several sites. With the new 16e, however, the interaction between phone and adapter seems to be difficult. When I press pause on the adapter, I get the message: "Bluetooth disconected". 2 seconds later: "Bluetooth conected" and the music starts playing again. If I press pause on the iPhone, the music remains paused, but the messages continue to appear until I press play again. Then the music continues. Does anyone know the reason for this annoying behaviour? Or am I making a mistake in the settings?