Were all the shadhdh (anomalous) readings considered Qur’an in the early period?

Some of the shaadhdhah (anomalous/irregular) readings were originally part of the Quran, then abrogated by the Final Review (al-'Ardah al-Akhirah) and compiled in Uthman's Mushaf. These were individual copies of the Mushaf belonging to Companions that did not conform to the Final Review. The Quranicity of the two surahs, al-Khal' and al-Hafd, attributed to Ubayy's Mushaf, is not accepted, as the Companions' copies of the Mushaf included ahadi (singular, non-mass-transmitted) readings, abrogated recitations, interpretations, and supplications. Verifying scholars have prohibited recitation with shaadhdh readings because they are not part of the mass-transmitted (mutawatir) Quran. Whoever recites them in prayer while knowing of their prohibition should be disciplined. However, if the meaning is not altered and no letter is added or removed, their prayer remains valid.