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Hi,
I can reproduce your problem and indeed the second grid is not detected with the default method. You can use the second available method as a workaround. The code becomes like this:
findCirclesGrid(image, patternSize, centers, CALIB_CB_SYMMETRIC_GRID + CALIB_CB_CLUSTERING)
The 4x3 grid was detected in this case.
P.S. It seems to be a bug that the grid was not detected initially so please fill in a bug report at http://code.opencv.org.