I had to turn on "High Quality" under the
Do you have different Display states defined in this assembly? If so, try to switch display state in the drawing view properties.
I would also looked in the assembly to see if the display style of the ring is set to "default" or if it is set to shaded with edges.
If this option differ from default, it will not be set to HLR when you insert the model in a drawing view.
Hope this helps,
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