System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: AMD Radeon HD 7800 Series ATI Technologies Inc. 4.5.14736 Core Profile Context 20.11.1 27.20.12033.2007

Blender Version
Broken: version: 3.2.1, branch: master, commit date: 2022-07-05 15:44, hash: rBa2d59b2dac9e
Worked: (version: 2.82a)

Short description of error
After applying the Mirror modifier to the GP stroke , it's impossible to erase the mirrored strokes which don't intersect the mirror axis. The bug is old , since blender 2.83.0 ,blender 2.82a and older versions work just fine.

notice the inconsistent behavior when i tried to erase one of the strokes that didn't intersect the mirror axis.

Exact steps for others to reproduce the error

• open new 2d animation
• add a Mirror modifier
• draw few strokes (the bug will not appear if all strokes intersect the mirror axis)
• apply the Mirror modifier
• in draw mode select the Erase tool (it's faster if set to erase strokes)
• try to erase all the strokes, the mirrored strokes are impossible to erase

the workaround is to duplicate the strokes to a new GP layer,
then the eraser tool works correctly again.