made some progress in saving and restoring the state during the simulation, with identical results.
Option to de/serialize btPersistentContactManifolds and fix lossy conversion during btMultiBody de/serialization of base world transform (serialize the quaternion, not the converted 3x3 matrix) There are still several caches not taken into account, and btMultiBody links/constraints are not deserialized yet etc. See examples\pybullet\examples\saveRestoreState.py for an example.
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