Transparency Threshold setting ignored in cached forward views?

Aecosim CONNECT U3

We are experiencing a recurring issue with transparency threshold in DV forward views being ignored when the views are cached.

During the set up of the DV in the composite model, transparency threshold is checked 'off' in the forward view.

However, when the resulting DV is displayed in the drawing file with cached view set to manual or automatic the transparency setting is ignored and elements with a transparent material attribute are still 'transparent'

Any pointers as to what we may be missing?

(Had the same issue in SS6)