- Fix a compile warning about using an obsolete enum in `GrpcExtensions.cs`. (#4812)
#### ml-agents / ml-agents-envs / gym-unity (Python)
- Fixed a bug that would cause an exception when `RunOptions` was deserialized via `pickle`. (#4842)
- Fixed a bug that can cause a crash if a behavior can appear during training in multi-environment training. (#4872)
## [1.7.2-preview] - 2020-12-22
vincentpierre