Contradiction with Genesis 11:9
This verse illustrates the confusion of languages at Babel, implying that understanding between different languages was not straightforward, whereas Genesis 42:23 suggests that Joseph's brothers were unaware of the interpretation happening between different languages.
Genesis 11:9: Therefore is the name of it called Babel; because the LORD did there confound the language of all the earth: and from thence did the LORD scatter them abroad upon the face of all the earth. [Babel: that is, Confusion]
Contradiction with Acts 2:6
This verse speaks of the miracle at Pentecost where everyone heard the apostles in their own language, contrasting with Genesis 42:23 where interpretation was needed for understanding.
Acts 2:6: Now when this was noised abroad, the multitude came together, and were confounded, because that every man heard them speak in his own language. [was...: Gr. voice was made confounded: or, troubled in mind]