The bond physics used prior to pucks version 0.1.25 was ineffective when pucks accelerated. It looked fine in dev.world19 because those pucks just bonded and drifted, without acceleration. Now the bond physics has been redesigned, and the result is demonstrated in this clip that shows bondevolver agents in dev.world20. Pucks can still break bonds by accelerating away from each other, and some of that happens here. The bond-strength setting has also been eliminated; there are no parameters for the new bond physics.