Sorry about the formatting above.
It looked perfectly ok when pasted into the browser but came out like it has when I pressed the submit button.
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So I promised to come back when I got confirmation from Apple.
and after 11 months in the pipe this is it...
"We reviewed your report and determined the behavior you experienced is currently functioning as intended."
So it does look like Auv3 in Logic on Apple Silicon has been deliberately sabotaged.