How to reproduce: 1.- Create a couple layers. 2.- Paint on one of them. 3.- Block it. 4.- Try to use ctrl + click (the default hotkey for the color picker tool) to select a color in the layer, you will be unable to. 5.- Try to directly select the color picker tool and then pick a color from the blocked layer: you will be able to. Expected result: Step (4) results in a color being picked.
Fixed by new interaction framework.