A bug in krita 3.0 alpha. It occurs when when I try to undo (Cmd z) a newly made folder group. after you press "ignore" on the dialog box the layer are ungrouped.

Using Cmd Alt G does work to ungroup layers without having a error dialog box pop up.

Reproducible: Always

Steps to Reproduce:
1.select multiple layers and hit Cmd Shift G to add these layers to a group
2.hit control Z
3.dialog box will appear

Actual Results:  
the layers are ungrouped if you push ignore on error dialog box

Expected Results:  
Layer should ungroup without the dialog box appearing