I've noticed this before, but I was just looking at some room images from Dischorran's new hold, and saw that they're not displayed with the custom style used in the hold, in this case Sandstone. Basically, there are several style mods that do not show up on the room images form H&S, the level viewer, etc. That's not to say that all custom styles are missing, for example Volcano, BlueBricks and InFlamesRock seem to work fine.
If room images are only generated once, it may be too much trouble to apply the styles retroactively. However, it would be nice if more/all custom styles were available for future room images. I'm not sure which ones are currently missing, but I'd suggest that at least the TCB styles from
this page should be available. Maybe a few others that aren't listed there too.
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Holds:
An Architects Audition,
Artful Architecture,
Salamander,
Elusive Exhibitions,
Leftover Levels,
Six Times Six
Collaborative:
Way Forward,
Advanced Concepts 2
Styles/Mods:
Basalt,
Sandstone,
Garden,
Clock using game elements