Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: rB77d23b0bd76f
Short description of error
Can't decrease the Subdivision Level in Sculpt mode (using Multires).
Exact steps for others to reproduce the error
Just launch Blender and switch to the Sculpt mode. Press "Ctrl+1", then press "Ctrl+2", "Ctrl+3", the mesh could be applied higher subdivision level. But then press "Ctrl+1" or "PageDown" key, nothing would happen. Although I could see the Subdivision Level was set to lower number, but the mesh topology had never changed.