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Not sure if glitch is on my end, but in the silk factory in the employee workout area there is a wall u r supposed to click on to make it crumble, revealing a lever. The wall up plain black, no texture at all. Playing Android version on my S7 edge.
It's not a glith. The breakable wall is indeed black. I try to make the breakable walls a slightly different color. Here my choice was pure black.