@sam_nazarko is it somehow possible to provide the old .deb files? As I understood, on repo there are just current versions:
osmc@osmc:~$ apt-cache madison rbp2-libcec-osmc
rbp2-libcec-osmc | 4.0.2-4 | http://apt.osmc.tv/ jessie/main armhf Packages
osmc@osmc:~$ apt-cache madison rbp2-mediacenter-osmc
rbp2-mediacenter-osmc | 17.1.0-3 | http://apt.osmc.tv/ jessie/main armhf Packages
Maybe its a temporary workaround for me to switch back to the march build?
Maybe the error in the log two posts before (‘unexpected setting value’) is somehow related to this, or the missing cec options see here? Maybe a wrong state which forces to reinitiate anynet+/cec connection?