Now if you mirror one tiny object on your painting you may spend a lot of time searching for your object because the mirror transformation has been applied to the whole layer even if it's almost empty. I suggest to restrict the mirror transformation by the selection boundaries (like in Photoshop. Reproducible: Always
+1
I think this bug is now fixed in master and will be released in Krita 4.2. Now you can test the new feature in developers' Krita Nightly builds :) https://binary-factory.kde.org/job/Krita_Nightly_Appimage_Build/