Bug - Entities only controllable in the upper area on iPad


On my iPad Pro 12‘‘ with any of the major browsers (Safari, Chrome, Firefox) it is impossible to move and control entities on the canvas below the upper 1/6 part of the screen.
The initial screen drawing is already limited to this upper part. When touching an entity in this part, the redraw works for the whole diagram, but still the entities on the below 5/6 part of the canvas are not controllable.

Many greetings,