So this is a bit different (I think) than the "Not Loaded" error that happens when assets get updated or change names.

I've noticed that a ton of assets just don't even show up in the building themes menu? For example, I'm subbed to the Bronx houses or whatever they're called - a series of 12 or so 1x4 and 1x3 houses. They show up in Find It! under the Growable ResLow filter, and I've also added RICO versions, but for some reason they don't show up at all in Building Themes.

And they're hardly alone. I've got around 3.5K assets, and of that maybe a hundred or so growable custom assets actually show up in the Building Themes menu to add to custom themes, with level and size filters set to "All"

I realise the BT Mod is old as dirt and is probably barely holding together behind the scenes in the wake of all the game updates and content releases since boformer's' last update in 2017, but is this fixable? Or am I better off just ditching Building Themes entirely and dealing with either the severely limited stock "Styles" system, or having crappy, mismatched R zoning?