I found a bug, where (only) on iOS devices the keyboard would not open when the “set focus” command is used.
After trying around I found set focus does not trigger if there is a “wait XY ms” command before the set focus. Without a wait command it always works:
Might this be a security measure of iOS to prevent klickjacking? Interestingly it also does not work if one uses a “fire event” command with a wait command before the fire event.
Also, on Android and PC there is never a problem.