OK, so more experimentation reveals that LR.getLRAttr() does work in development mode, but it throws the "Not implemented" error if a step is executed by itself. No obvious reason the interpreter should not have access to the LR attributes when a single step is executed. The API works OK if the script is run in step-by-step mode, it appears that only "Replay selected step" (or using the "Play this step only" button inside a step) does not work.
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