Problem with DMX Input when Port B is active

[heikoxxxx]

Hello, having the problem that DMX Input works well for me if i dont have any output on Port B.

But if i connect WS2812 stripes on output B and send Data to this, or i configure Port B as DMX Output the Port A input brings me a lot of incorrect values from my Light Controll to PC over Artnet.

Is there any Bugfix or do you think it is hardware related? Checked all Pullup resistors but dont seem that this is the Problem. Hope you can help me.

Thanks a lot :-)