Whilst some tasks do show successful ramp building (Figure 21), some hand-authored
tasks require multiple ramps to be built to navigate up multiple floors which are inaccessible. In these tasks the agent fails.
From this, I’m guessing that it sometimes succeeds to build one ramp, but fails when the task requires building multiple ramps.
On page 28 they say:
From this, I’m guessing that it sometimes succeeds to build one ramp, but fails when the task requires building multiple ramps.
Nice, I missed that! Thanks!