Hi, it's not a bug, you just need to have the same color box as the monster.
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OOOOOOh, I have booooxes. It was really hard to notice my robot carrying a box in front of it, i saw the interaction on the boxes, but I wasn't seeing any visual feedback or changes. Yeah, sorry about that. This will actually help you, some feedback on interactions and a way for the players to see that they hold a box in front. Especially a blue one, which seemed part of my robot.