Gigapixel AI v4.0.0 some observations with Maximum quality AI models

I’ve just updated to Gigapixel AI version 4.0.0. What puzzled me is that the option “Use maximum quality AI models” frequently produces worse quality output than the standard faster processing in areas without detail like skies, I get noise even with Suppress Noise at High. Also, in areas with high frequency detail like trees, grass, rocks etc. I get better detail with Use maximum quality AI models turned off.

Is it just me? Does anybody else have the same experience?
Please see below some examples: (click on the images for full resolution)

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Please raise a support request at the Need Help? link above. The product is a Studio standalone.

Ok, thanks!