I found 2 bugs today but I'm not sure if this is already reported.
The first bug was as I created a second window with "new view" as I wanted set it to full-screen on my second monitor the window goes white and didn't show anything.
The second bug I got is with the pen tool if I TAB out sometime it creates a random point on the artboard and sometimes it doesn't want to make points after I TAB back in.
Overall I like affinity designer but why it always jumps back to the artboard and doesn't want to stay in the group I created, so I need to bring all parts manually back into the group I created before. This can be really frustrating if you have other parts outside the group and doesn't know now with parts belongs to the group.