Version - 'Domum Ornamentum': 1.20-1.0.151-Beta
Version - 'Diagonal Windows': 8.1.3-1.20.1-Forge
['Diagonal Fences' is not affected]

Blocks that originate from 'Domum Ornamentum' is shown on Walia as from 'Diagonal Windows'.
Visual comparision: (1: Is // 2: Is supposed to be)

Those blocks are also not craftable in the Architect's Cutter from 'Domum Ornamentum'.
Visual Comparision: (1: Is // 2: Is supposed to be)

This bug-report has also been posted here: Fuzss/diagonalwindows#12