When a layer has a transparent color assigned to the layer in a block instance, Rhino 8 (and 7) renders the layer incorrectly - it either doesn’t render it at all or it renders it without transparency.
The attached set of models demonstrates this problem. Model C includes 2 instances of B, which includes an instance of A. Model A has two helper layers, one of which has a layer color set to 50% transparency.
rhino-layer-transparency-issue.7z (132.7 KB)
The following video shows the problem - when selecting a block instance, the transparent layer isn’t rendered at all, and when hiding another layer (from the same block instance), the transparent layer is rendered opaque.
System info:
systeminfo-20251229.txt (3.2 KB)
This isn’t a very critical problem, but it’s annoying anyway, because I rely on layer transparency to see overlapping items. I use these helper layers to keep various important points / curves for parts of a larger model hidden away but available.