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Have anything changed within O365 for ListViewExtenders (SPFX) - I'm getting an error - on a brand new project

This error is shown in the console :

Uncaught Error: There is no operation handler registered for '{"operation_3":["getItems_1","spField_306"]}'.

My previous project has been working for months - but now is showing the wrong button name - and so I created a brand new project (SPFX v1.8).

Any ideas - or answers ?

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