https://bugs.kde.org/show_bug.cgi?id=491447

            Bug ID: 491447
           Summary: liquify + filter layers cause layers to not be loaded
    Classification: Applications
           Product: krita
           Version: 5.2.3
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Filter Layers
          Assignee: krita-bugs-n...@kde.org
          Reporter: yuval...@gmail.com
  Target Milestone: ---

Created attachment 172409
  --> https://bugs.kde.org/attachment.cgi?id=172409&action=edit
minimal file that demonstrates this bug

SUMMARY
there is a weird caching thing where if a liquify transform layer applies to a
layer setup using filter layers, the whole stack does not load on startup. you
need to manually hide and unhide some layers deep down within the hierarchy to
trigger krita to recalculate the whole thing and display any image.

STEPS TO REPRODUCE
1. have a file with a liquify transform layer applying to a layer with a filter
mask of sorts (potentially other such cases, but this is the simplest case i
could find)
2. open the file

OBSERVED RESULT:
nothing shows, even when i hide the liquify layer. only when i hide and unhide
the filter mask, then krita updates that layer.

EXPECTED RESULT:
after waiting for the liquify layer to apply, i'd see the image.
alternatively, if i hide the liquify layer i'd expect to see the original paint
layer with the filter mask applied to it, as that should cancel the processing
of the liquify layer

ADDITIONAL INFORMATION:
i have many projects with dozens of layers and liquify transform layers for
non-destructive editing.
this bug was introduced seemingly recently, as i remember this not being the
case. now working with any of my project files is incredibly cumbersome, i have
to hunt down in the layer stack for single layers very deep within the groups,
to trigger krita to update the whole thing.

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