Not a bug. Large wheels have 5 fixed connection points on their external face, as well as 4 fixed connection points around their perimeter. Objects attached to these points will attempt to rotate/move in relation to the wheel
there is a video on how to make tank tracks, but it's several versions old, and you may need to adjust the instructions as appropriate. Jump to 1:41 to bypass all of his intro stuff: https://youtu.be/SliTZ-hZXMo?t=1m41s
I've made a spacecraft which operates in six axes and utilizes androgynous dock/berth connectors allowing two craft to be docked together, or berthed to a separate location. controls for the single craft are a bit cramped but are designed to include the yet-to-be-implemented second craft
I've done further testing regarding websites sharing .bsg files I discovered a few blocks I failed to apply to the initial test.
The Small Wheel, Large Wheel, and Powered Cog also exhibit their toggleable setting being unset when downloaded from the Steam Workshop.
For testing against other...