Given the question: Given the following passage  "A core problem in the study of early Buddhism is the relation between dhyana and insight. Schmithausen, in his often-cited article On some Aspects of Descriptions or Theories of 'Liberating Insight' and 'Enlightenment' in Early Buddhism notes that the mention of the four noble truths as constituting "liberating insight", which is attained after mastering the Rupa Jhanas, is a later addition to texts such as Majjhima Nikaya 36.[page needed]",  answer the following question. Note that the answer is present within the text.  Question: What was an issue in the theories?
The answer is:
the mention of the four noble truths as constituting "liberating insight"