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GPencil: Strokes go missing after Interpolation from another layer
Closed, ResolvedPublicBUG

Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87

Blender Version
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: rB211b6c29f771
Worked: (newest version of Blender that worked as expected)

Short description of error
2D Animation in Grease Pencil.
When interpolating in between two keys from a layer X, some images/strokes from another layer Y just disappear.

When modifying the key on which the image disappear (delete some points or add some strokes) and then redo the process of interpolation (from a different layer X ), the image that was disappearing still disappear BUT the new strokes stays.
See video attached.

If we successfully isolated the key affected by the disappearing, we do not know why it affected this one in particular and strangely enough we could safely isolate it from the other keys (move it around the timeline) without changing the disappearance.

Exact steps for others to reproduce the error

  • Open attached .blend file
  • Interpolate in between the 2 keys of the 'to_interpolate' layer
  • Image on the "do_not-touch" layer should disappear

Thanks for your help.