There are some old bugs that are not yet fixed along with a couple new ones
Old
- mirror checkmark and deleted history are (as long as you're running ios 13 beta 3, 3 re-release or 4) still issues.
- the app switcher thumbnail is still stretched after rotating the device.
- after hiding or unhiding a layer and zooming out the thumbnail still shows the layer or not, respectively.
- sometimes the color, brush and layers menus are still smaller that they should upon re-entering the app.
- it rarely happens that layers still disappear when hiding/unhiding.
New
- some layers show a different layer's thumbnail while being hidden/unhidden. It's random, might be hard to reproduce.
- the Elastify tool sometimes won't visually show any differences but will still process the changes when applied. The final image will not be different though.