Mask created by painting with a stencil breaks after reopening the file

[Shana27906577oa6o]

version 8.2.0, windows 10.

I created a mask on a fill layer and painted on it by using a stencil. I redid the painting in the mask multiple times before I achieved the proper result, I had to update the stencil a few times too. The stencil was saved in the project, not permanently or for this session only. 

Now upon reopening the file, the mask is showing correctly. However upon making any changes to the file (new layer, turning a mask on and off, turning a layer on and off, a brushstroke ...) the stencil painted mask CHANGES. It changes back to an old attempt with the faulty stencil. This version of the painted mask was never saved out nor is the old stencil present in my project anymore and should therefore not be remembered by the file. I did not update the mesh or anything, only opening the file and making a single adjustment. 

I wish I could add some photo's here as it's so visible and easily recognized but due to NDA's I cannot.  

[GeoffroySC]

Hi,

If you ever reproduce on a dummy project, it would be really helpful to provide us with the repro steps. This would allow us to correct any bugs! 

Thank you,

Kind Regards,

Geoffroy SC