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Incorrect normal map with material.side = THREE.DoubleSide + flatShading = true
Description
Normal maps are displayed incorrectly when material.side = THREE.DoubleSide + flatShading = true
Broken with #25693 (confirmed with git bisect).
Related bug: #25701
Reproduction steps
- Create a double-sided material having a normal map and flat shading set to true
- Extrusions on one side should appear as indentations on the other side
r156