We are having the exact same issue - have set up classes for the Bed, Cloud and Line with different coloured attributes for Fill and Pen, but the Landscape Area tool doesn't seem to recognise the Fill, only the line.
I've made a video showing what I mean here (apologies for slight waffle - you can tell that I'm not used to where things are in VW25 yet!)
Is this a bug or something that I'm missing/don't understand? I feel like I've got it right...
All advice appreciated - how are you getting on now @Jonk and @Tom W.?
I'm on a Mac Studio M1 Max using Sequoia.