Question regarding development of non canonical narratives referred to in the Quran
it's a common opinion that the Quran refers to narratives not found within canonical biblical texts like say, infancy Gospels ( Isa's speaking infant, Mariam's narrative ), jubilee and apocalypse of abraham ( for Abraham's elaborated backstory and portrayal as the idol smasher ), these as far as my knowledge goes, have not been accepted as canonical or authoritative by the majority of christian and jewish traditions and central institutions.
why would these narratives emerge while they have no known precedent or reference prior to the dating of their inception ? why did they circulate so quickly and were cemented in the public consciousness so much so that the Quran treated them as authoritative and by implication canonical and "correct" ? did the clergy representing the official institutions not regulate the public opinion through ceremony/ study to at least maintaining it ? did they not issue statements renouncing these narratives as false ?
also, wouldn't the Quran reiterating these narratives ( if taken to be fabrications ) as the truths despite them not fulfilling the conditions of being found universally in prior scripture, be somewhat of an issue for Muslim theologians, as the tahrif argument won't can't apply to a tradition that acknowledges and documents it's own debates and pitfalls, archaic as it is, does not contain these rather "recent" narratives that are treated as being available/ obfuscated from that very tradition.
the questions to clarify are : do we have an explanation for these emerging narratives / did we study examples of these occuring in communities ( i know this is a no brainer since misinformation is the normal here in the internet but a study helps organize information like this into a framework ).
note 1) : this post is NOT made with polemical intent, as such please keep the comments charitable, earnest and open minded.
note 2) : sorry if this sounds all over the place, I've been lurking this community for long and i wanted to see what engagement questions like this would receive.