Roland Steiner wrote:
,
> Discussions of syllables occur more extensively in works on metrics
> and in the Prātiśākhyas and Śikṣās.

Critical Studies in the Phonetic Observations of Indian Grammarians by  Siddheswar Varma
discusses syllabication  in the Prātiśākhyas and Śikṣās.
https://archive.org/download/CriticalStudiesInThePhoneticObservationsOfIndianGrammariansSiddheshwarVarma/Critical%20Studies%20in%20the%20Phonetic%20Observations%20of%20Indian%20Grammarians_Siddheshwar%20Varma.pdf

Harry Spier