C for the Crop tool and O for Dodge/Burn are still there and work at my end. One thing to note, the Crop tool can sort of "go into the background" in which case C won't bring it forward. Tap V for the Move tool then C to get the Crop tool back in front.
As for Crop missing from the toolbar, what workspace are you in? Essentials? Photography? 3D? The Crop tool is unavailable in the 3D work space. Otherwise, try resetting the current workspace
Same issue here - Photoshop is "helping" me with different workspaces that hides what they think is unnecessary. I have tried to customize the toolbox but it seems you can only have a preset number of tools.
This is a rant - no need to reply
Unhappy to use an eternal beta and spending time searching for clues to why "it no longer work"