Block instance edge lines not visible in Technical display mode

Hi, in my design I have two blocks. In Technical display mode, only one block’s edges are visible, the other not. Why? See the file attached. Both blocks sit on the same layer, both were created with linetype/display color/print color switched to “by layer” option.

Using Rhino for mac, version 5.3.2

hidden lines.3dm (3.6 MB)

Anybody? Would @John_Brock or @wim know what’s causing the issue?

This looks like a case of this bug (RH-36913) to me.