System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.50

Blender Version
Broken: version: 2.83 (sub 6), branch: master, commit date: 2020-03-06 10:05, hash: rB7d9a5b7b10b4

Short description of error
The transform tools do not take Face Sets into account when making a transform

Exact steps for others to reproduce the error
Remesh a cube and paint a part of the mesh to a face set, which you then isolate. Then try using a regular brush on it and unhide the rest of the mesh. Then undo that and select any Transform tool and repeat the same action.