https://bugs.kde.org/show_bug.cgi?id=452471

            Bug ID: 452471
           Summary: Krita prealpha 5.1.0 : Whole canvas become transparent
                    when you use E key to switch to Eraser
           Product: krita
           Version: nightly build (please specify the git hash!)
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: tgdev...@gmail.com
  Target Milestone: ---

Krita  version : 5.1.0 prealpha git(59f3789)

Display issue : Whole canvas pixels disappear when you switch to eraser mode
using the
10 brush scripts shortcut or eraser mode(glitches of null canvas pixels
randomly
appear if you activate the erase blending mode)

STEPS TO REPRODUCE
1. create an A4 document @300 ppi
2. Zoom in past 100% at least(zoom level >= 100%)
3. use "E" shortcut to switch to an eraser brush or eraser blending mode

OBSERVED RESULT
1. All or almost all the displayed pixels disappear, leaving a fully
transparent canvas
in the viewport
2. Panning afterwards may temporarily bring back the display to normal

EXPECTED RESULT
The viewport is not supposed to suffer at all from an issue like this
and is meant to properly show the canvas whether you zoom in or out or switch
brushes. 
Glitches shouldn't appear at all.

SOFTWARE/OS VERSIONS
Windows: 10 21H1

ADDITIONAL INFORMATION
API in use : Wintab
Use tablet drivestamps for brush speed : false(unticked in other words)

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