System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 770/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.30
Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-01-18 23:28, hash: rB09c7c6389052
Short description of error
Interactively setting the voxel resolution of a sculpt is keymapped to Shift+R
Repeat Last operator is keymapped to Shift+R
Remesh takes priority over Repeat but while it can ONLY run in the 3D view, Repeat is blocked from being ran by for example moving the mouse to a different area to activate it.
Since Remesh is disabled during Dyntopo, Repeat will then be able to run in sculpt mode again.
Those are two factors of this issue. The big issue being these two operators share the same keymap, which then creates conflicts of what pressing the key does.