Cubase 12 Pro, Win10 PC stalls on project close

Repeatable problem. Currently using projects created under Cubase 11 pro.
When closing a project (Using File->Close) the project window closes and then appears to stall. The VST racks are not unloaded, control surface is not zeroed and UA plugins are not unloaded from DSP. The only way out at this stage is to terminate the Cubase 12 process.
Interface: UA Apollo Quad TB3
Surface: SSL Nucleus 2
PC: Desktop i9 10th Gen, 64G, Win10 Pro.

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