System Information

Blender Version
2.81 (sub 10), branch: master, commit date: 2019-09-12 09:34, hash: 492a7998d508, type: Release build date: 12/09/2019, 02:38
Platform: Windows

Short description of error
A changed tool parameter in sculpt mode can't be undone. Instead the last viewport action will be undone.

Exact steps for others to reproduce the error

1. Create a base mesh like a cube or sphere.
2. Sculpt something.
3. Change a tool parameter value, like brush "strength".
4. Use undo
5. -> The changed tool parameter doesn't reset to the origin value. Instead the recent brush stroke will be undone.

See my screenshot for more infos , please.