**System Information**
Operating system: Windows 10
Graphics card: Nvidia GeForce GTX 1050 Ti
**Blender Version**
Broken: 2.82 (as found on the splash screen)
Worked: (optional)
**Short description of error**
I duplicate (Shift+D) previously edited grease pencil object (hereafter - GP-object) (NOT create instances (Alt+D) and not add new empty GP-object (Shift+A))
Then I draw new shapes in duplicated GP-objects and save my changes.
Then sometimes (not always) when I reopen the saved blender file I see that all edited duplicates of GP-object are rolled back to the original shape.
**Exact steps for others to reproduce the error**
{F8347277}