After the latest update context.previousSceneSamePOV.lastWords is a valid function (thanks!), but it seems to always be getting the last words of the immediately previous scene regardless of if the POV matches or not, making it functionally same as context.previousScene.lastWords.
However, interestingly if the scene the function is called from is the first scene where a particular POV is used, then the function gets nothing, as expected.