First, from 4.12 to 4.13, you changed the order that the angular limits are listed. They did line up with XYZ, Now it is XZY. Perhaps you want it this way now, having done it the other way for so long, this new order really through me off.
Anyway, the bug is in the visual feedback of the angular limits. The Z or Swing 2Motion is not displayed properly.
As you can see below in this 4.12 version of the same asset, there are 3 indicators, R,G & B. Blue is for Swing 2Motion, which you can’t see in the image above (4.13)
I just wanted to let you know that this issue is actually by design, as in, it was an intended change to the engine. This is the explanation as to why:
The old way of showing 3 fans, while easier for new people to use, does not give full information about the underlying constraints which are really a cone and twist.