System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19

Blender Version
Broken: version: 2.83 (I only test this two version 03/04,13/4(the newest) build) commit date: 2020/4/13, hash: rBunknown
Worked:
work with the 2.82a stable
Short description of error

Grease Pencil doesn't work properly in sculpt mode in a already existing file(with the new grease pencil object add),

Exact steps for others to reproduce the error

1.when creating a new file ,selecting with 2d animation , the sculpt mode work well with the first grease pencil
2.but for the next grease pencil object ,it cannot use the sculpt mode(the brush doesn't affect it )
3.worst,you add a grease pencil in a existing file ,you can't even see the size of the sculpt brush

same question 2 weeks ago in community https://blender.community/c/today/BYdbbc/

[Based on the default startup or an attached .blend file (as simple as possible)]

build with 2d

build with empty normal ,then add new object

THANKS!