Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 399.24
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-19 18:29, hash: rBd30f72dfd8ac
Also: in sculpt branch was the same behaviour.
Worked: Blender 2.79b
Short description of error
When Blender finds vertex data during turning on Dyntopo, the checkbox doesn't check, properties panel doesn't change until hovering on checkbox.
Exact steps for others to reproduce the error
Start Blender with default cube (as it already has UV's, the bug will occure).
Go to Sculpting mode
Press Dyntopo checkbox
Press "OK" in warning window
If your cursor is not over Dyntopo checkbox, it will not be checked. Dyntopo itself is enabled.
Hover cursor over the checkbox - it checks and additional option "Topology Rake" will appear in the "Brush" scroll.