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I found the difference. It was related to the kernel I used. The kernel was based on a division with 2 floating matrices.

cv::divide changed it's behaviour for floating point division. 3.4.1 sets results with Zero-points in the divisor to "0", 4.2.0 to "NaN" (Not a number).

Doku 3.4.1

Doku 4.2.0