[bug] normal map multiplier is ignored by the light baker in baked normal map mode

[laurentopia]

[guycalledfrank]

Not a bug really. The problem is:

• Normal map strength is really just a property of a particular shader.
• Unity does not support exporting normals from shaders to its lightmappers (meta pass doesn't output normals).
• Therefore Bakery simply takes anything named "_BumpMap" (or a similar default name in HDRP/URP) and uses it. It doesn't know if the shader has any multipliers, blending of different normal map layers, procedural normals, etc.
• In case you really want to use custom shader-modified normals, there is a way, but it requires modifying the shader, so Bakery recognizes it,

Documented here: https://geom.io/bakery/wiki/index.php?title=Manual#Normal_mapping

This is only a problem with Baked Normal Maps mode, as normal maps have to be exported directly to the lightmapper. Other directional modes don't need that.