Structure Checker: Valence Error not detected

I am using Structure Checker 5.12.3.   The misdrawn nitrobenzene structure ( ON(=O)C1=CC=CC=C1 and also attached .mrv file), with a formula of C6H7NO2, clearly has a valence error at the nitrogen.  The Valence Error Checker does not detect any errors with this molecule.

Older versions of Structure Checker (such as 5.10.1) do correctly identify this molecule as having a valence error.

Please fix this bug.

Please, find the relevant documentation about valence handling in case of nitrogen containing molecules here.

In version 6.0, we will introduce the  "Valence Checker:  Allow traditional N representation" option, so the user can decide on the valence checker behavior in case of nitrogen containing compounds.

Best regards,

Viktoria