Recent studies of morphological, larval, and molecular data are all indicating that Incini and Osmodermatini are more closely related to other Cetoniinae than to Trichiini. See for example:

Löbl, I. & Löbl, D. (Eds.) (2016) Catalogue of Palaearctic Coleoptera. Vol. 3. Scarabaeoidea—Scirtoidea—Dascilloidea—Buprestoidea—Byrrhoidea. Revised and Updated Edition. Brill, Leiden, 983 pp.

http://dx.doi.org/10.1016/j.ympev.2016.05.012

https://doi.org/10.1111/j.1365-3113.2007.00399.x

https://doi.org/10.5852/ejt.2021.748.1335