Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Radeon (TM) RX 470 Graphics ATI Technologies Inc. 4.5.14736 Core Profile Context 20.8.1 27.20.2001.13001
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-25 19:28, hash: rB396d39c6b904
Worked: (newest version of Blender that worked as expected)
Short description of error
When doing an simulation (tested it on cloth and rigid body sim), adjusting a F-curve modifier of a forcefield doesn't reset the frame in memory.
Exact steps for others to reproduce the error
Set up a basic simulation with and object and a forcefield. Add a F-curve modifier to the intensity of the forcefield. Change a setting in the modifier: the frames in memory don't reset.