completion of one task by two duplicates, termination of construction + visual bug

1) in the first video you can see how the biobot accepts an order to build a staircase

2) in the second video, first on the left, 2 duplicates are trying to build 1 staircase. The first duplicate starts first, after which the second one comes up and completes the ladder for him. and the first one loses the instrument from his hands. Further on the right side of the video, the construction order is confused due to
for digging up the ground (although those who built the stairs were in a stable position and this should not have interrupted their actions) and as a result, the biobot again takes away the construction order, and the tool disappears from the hands of the duplicate.