Bug report #12005
"simplify feature" tool silently fails if a layer is reprojected in another CRS
|Affected QGIS version:||master||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||duplicate|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||20208|
If it is not supposed to work then better disable the tool in the advanced digitizing toolbar in such situations.