I believe the rangefinder baseline of the Bessa cameras is simply too narrow to be able to accurately focus a 135mm lens. And that probably is where your answer is.

The rangefinder baseline -- the distance between the two windows -- is 37mm. With the 0.7x viewfinder, the effective base becomes 25.9mm. With the Zeiss Ikon, the actual base is 75mm (twice that of the Bessa) and the effective is 55.9mm (more than twice that of the Bessa).

A wider rangefinder baseline allows for more accurate focusing, which becomes more important as you use longer lenses. I think the longest Cosina Voigtlander lens for the Bessa was 75mm. The 135mm is considerably longer than that, and you've probably exceeded the margin of accuracy of the camera's rangefinder.