AGI: KQ3: Staircase issues with Rosella

[patziert]

During endgame, escorting princess Rosella, she is positioned to turns into a insurmountable roadblock on the second staircase screen unless using the numpads diagonal button (3) to move down the stairs already from the first screen on. Game seems to be unwinnable using just standard arrow key on keyboards without numpad and without reconfiguring keys / using virtual input methods.