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This is a bug in NiceMatrix 3.13

The author will fix it in the update 3.14

Thanks for your replay.

The problem occurs with version 3.13 of NiceMatrix.

It seems, like there are no problems with 3.11 and older... which version did you use?

First of all, hey guys and thanks :-)

The problem occurs when using the NiceMatrix-Package with the \Block-Command. It seems like there is a problem, if the matrix-indicies that the block covers exceed 10.

First of all, a working example:
\documentclass[12pt]{article}

\usepackage{amsmath ...