AMD has released a Crimson driver hotfix (16.9.1) in order to support the API within Deus Ex: Mankind Divided. This comes after Eidos Montreal helped DirectX 12 Support for the game with a PC patch.
The hotfix will bring support for DX12 in the game to Radeon graphics card owners as well as a Crossfire profile for DirectX 11 in Dota 2. There's a handful of other fixes as well, including fixing bugs in DiRT Rally rain drops and application hangs in GTA V, but most of these are very minor.
There may still be issues with Mankind Divided even after these updates and patches as it is still a preview version of DX12 support, but the final DX12 release is due to arrive in a few weeks, as well as multi-GPU support.