Attached is one more example of the sideways 'm' (here written at the end of a word) in Beneventan script, see also Fig. 106 in the following source:
Rozana Vojvoda, Dalmatian Illuminated Manuscripts Written in Beneventan Script and Benedectine Scriptoria in Zadar, Dubrovnik and Trogir, PhD Dissertation in Medieval Studies, Department of Medieval Studies, Central European University, Budapest, Hungary, April 2011, Available: <https://www.etd.ceu.edu/2011/mphvor01.pdf>.
It seems that the second red embellishment in You are not allowed to view links. Register or Login to view. depicts three Beneventan letters, a two-letter ligature and the sideways 'm' in the middle.
Rozana Vojvoda, Dalmatian Illuminated Manuscripts Written in Beneventan Script and Benedectine Scriptoria in Zadar, Dubrovnik and Trogir, PhD Dissertation in Medieval Studies, Department of Medieval Studies, Central European University, Budapest, Hungary, April 2011, Available: <https://www.etd.ceu.edu/2011/mphvor01.pdf>.
It seems that the second red embellishment in You are not allowed to view links. Register or Login to view. depicts three Beneventan letters, a two-letter ligature and the sideways 'm' in the middle.