Courtesy of a big thunderstorm today I used a Macbook Air 15" M2 running on battery power positioned just about 40cm away from the controllers and the connection to them was very stable. Not a single drop out.
The Mac Pro desktop (a 5,1 model) with bluetooth antenna at the back of the case always doesn’t have the best signal strength so it seems. That’s my guess anyway.
I wonder what your scenario is like in terms of distance?