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try using a plug-in Solid Quantify by TAK2ATA. author website http://sketchup-onigiri.jimdo.com/plugin-other/
I reported that years ago... BUT 'they' still haven't fixed it ! π
I see what you're saying, I would only tend to adjust individual textured surfaces after painting everything depending on what sort of final export/output needed, never had any bugs using this method, must be luck!